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Youssef IM, Elsherbeni AI, Almuraee AA, Nass NM, Beyari EA, Alshammarii NM, Abdel-Ghany AM, Ahmed ESG, Nasr S, Youssef KM, Salem HM, Abd El-Hack ME, Saber HS. Influence of using synbiotics by various routes on Mandarah male chicks: intestinal bacterial counts, gut morphology and histological status. Poult Sci 2024; 103:103601. [PMID: 38503136 PMCID: PMC10966297 DOI: 10.1016/j.psj.2024.103601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/23/2024] [Accepted: 02/23/2024] [Indexed: 03/21/2024] Open
Abstract
This experiment investigated the influence of different synbiotic processing methods on the intestinal bacterial count, morphology and histological status of developed male Mandarah chicks. Two hundred and ten male Mandarah line chicks aged 1 d were randomized to receive one of 7 chicks. The method and dose for 1-time synbiotics administration to the day-old chicks were as follows: G1: chicks on basal diet received no treatment (control); G2: 0.25 mL synbiotics sprayed; G3: 0.50 mL synbiotics sprayed; G4: 0.25 mL of synbiotics are added to drinking water; G5: 0.50 mL of synbiotics are added to drinking water; G6: 0.25 mL of synbiotics dripped into the mouth; and G7: 0.50 mL of synbiotics dripped into mouth drops. Lactic acid bacteria(LAB) were significantly increased (P<0.0001) compared to the control group and other treated groups and had the maximum values after the use of synbiotics via drinking water (0.25 or 0.50 mL). Furthermore, when comparing the treated birds (G4, G5) with the control birds, the Escherichia coli concentration in the drinking water containing synbiotics was significantly lower. In addition, treated chickens at (G7) showed a higher duodenum, ileum villus height (VH), and VH. - Ileum crypt depth (CD) ratio compared to other groups. In addition, birds treated with 0.50 mL of synbiotics in drinking water (G5) performed better in duodenum, ileum, CD and VH. - CD ratio than the other groups. Meanwhile, intestinal tract length and visceral pH did not differ significantly between groups. It can be concluded that the use of 0.25 mL of synbiotics in drinking water can improve the overall health of birds.
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Affiliation(s)
- Islam M Youssef
- Animal Production Research Institute, Agriculture Research Center, Dokki, Giza 12618, Egypt.
| | - Ahmed I Elsherbeni
- Animal Production Research Institute, Agriculture Research Center, Dokki, Giza 12618, Egypt
| | - Areej A Almuraee
- Clinical Nutrition Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Makkah 21955, Saudi Arabia
| | - Nada M Nass
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia; Immunology Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Eman A Beyari
- Department of Biological Sciences, Microbiology, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Naheda M Alshammarii
- Department of Biological Sciences, Microbiology, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Ahmed M Abdel-Ghany
- Animal Production Department, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt
| | - El-Sayed G Ahmed
- Animal Production Department, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt
| | - Samia Nasr
- Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia
| | - Khaled M Youssef
- Food Technology Department, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt
| | - Heba M Salem
- Department of Poultry Diseases, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
| | - Mohamed E Abd El-Hack
- Poultry Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt
| | - Hamada S Saber
- Animal Production Department, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt
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Romano V, Ferrara M, Gatti F, Airaldi M, Borroni D, Aragona E, Rocha-de-Lossada C, Gabrielli F, Papa FT, Romano MR, Calza S, Semeraro F. Topical Antiseptics in Minimizing Ocular Surface Bacterial Load Before Ophthalmic Surgery: A Randomized Controlled Trial. Am J Ophthalmol 2024; 261:165-175. [PMID: 38211781 DOI: 10.1016/j.ajo.2024.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/28/2023] [Accepted: 01/05/2024] [Indexed: 01/13/2024]
Abstract
PURPOSE To investigate the reduction of the ocular surface bacterial load induced by 2 commercially available ophthalmic antiseptic formulations, povidone-iodine (PVI) 0.6% and chlorhexidine (CLX) 0.02%, before ocular surgery. DESIGN Randomized controlled trial. METHODS Seventy adult patients undergoing intraocular surgery (phacoemulsification) were randomized to receive in the index eye PVI (group A) 4 times a day for 3 days or CLX (group B) 4 times a day for 3 days before surgery. The untreated eye was used as control. A conjunctival swab was taken in both eyes before (T0) and after (T1) therapy. Microbial DNA was quantified with real-time polymerase chain reaction (PCR) analysis. The Mick algorithm was used to compare the abundance of each genus/genera against the distribution of abundances from the reference. At T1, patients filled a questionnaire to evaluate therapy-induced symptoms. Primary outcome was the reduction of bacterial DNA at T1 (microbial load), vs control arm, expressed as mean number of real-time PCR cycle times (CTs). Secondary outcomes were taxonomic composition, differential abundance, and therapy-induced ocular symptoms. RESULTS The T0-T1 difference in CT was significant in group B, but not in group A (mean [95% CI], 0.99 [0.33] vs 0.26 [0.15], P < .001, and 0.65 [0.3] vs 0.45 [0.41], P = .09, respectively). The taxonomic composition, alpha, and beta diversity remained consistent at all time points in both groups. The rate of patients reporting therapy-induced ocular symptoms and the mean discomfort grade were greater in group A than in group B (97% vs 26% and 4.97±2.48 vs 0.66±1.53, respectively). CONCLUSIONS Compared with PVI 0.6%, CLX 0.02% induced a greater reduction of ocular surface bacterial load, with no significant alterations of the taxonomic composition. Moreover, CLX was better tolerated than PVI.
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Affiliation(s)
- Vito Romano
- From the Eye Unit, ASST Spedali Civili di Brescia (V.R., F.S.), Brescia, Italy; Eye Unit, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia (V.R., Fr.G., F.S.), Brescia, Italy
| | | | - Francesca Gatti
- Eye Unit, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia (V.R., Fr.G., F.S.), Brescia, Italy
| | - Matteo Airaldi
- Department of Molecular and Translational Medicine, Università degli Studi di Brescia (M.A.), Brescia, Italy; St. Paul's Eye Unit, Royal Liverpool University Hospital (M.A.), Liverpool, United Kingdom
| | - Davide Borroni
- Eyemetagenomics Ltd, Covent Garden (D.B., C.R.-d.-l.), London, United Kingdom
| | - Emanuela Aragona
- Department of Ophthalmology, IRCCS San Raffaele Scientific Institute (E.A.), Milan, Italy
| | - Carlos Rocha-de-Lossada
- Eyemetagenomics Ltd, Covent Garden (D.B., C.R.-d.-l.), London, United Kingdom; Ophthalmology Department, QVision, Vithas Almería (C.R.-d.-l.), Almeria, Spain; Ophthalmology Department, Hospital Regional Universitario Málaga (C.R.-d.-l.), Malaga, Spain
| | - Federico Gabrielli
- Biolab SRL, Laboratorio di Genetica e Genomica Molecolare (Fe.G., F.T.P.), Ascoli Piceno, Italy
| | - Filomena Tiziana Papa
- Biolab SRL, Laboratorio di Genetica e Genomica Molecolare (Fe.G., F.T.P.), Ascoli Piceno, Italy
| | - Mario R Romano
- Department of Biomedical Sciences, Humanitas University (M.R.R.), Milan, Italy; Department of Ophthalmology, Humanitas Gavazzeni-Castelli (M.R.R.), Bergamo, Italy
| | - Stefano Calza
- Unit of Biostatistics and Bioinformatics, Department of Molecular and Translational Medicine, University of Brescia (S.C.), Brescia, Italy
| | - Francesco Semeraro
- From the Eye Unit, ASST Spedali Civili di Brescia (V.R., F.S.), Brescia, Italy; Eye Unit, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia (V.R., Fr.G., F.S.), Brescia, Italy
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Ceylan AN, Toprak A, Doymaz MZ, Sümbül B. Comparative analysis of different loop types for urine culture collection: Implications for quantitative bacterial growth and culture results. Diagn Microbiol Infect Dis 2024; 108:116192. [PMID: 38330685 DOI: 10.1016/j.diagmicrobio.2024.116192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 01/20/2024] [Accepted: 01/22/2024] [Indexed: 02/10/2024]
Abstract
We hypothesized that the loop material and size could affect the results of the culture when compared to the calibrated pipette. A total of 484 urine samples were included in the study, and each sample was plated by using different loop types and the calibrated pipette. The bacterial counts per milliliter were calculated and compared, with a focus on the important cutoff values of 10³ and 10⁴ CFU/ml for further identification. When considering the 10³ CFU/ml as cutoff value, 1 µl and 10 µl plastic loops gave the highest sensitivity (86.8 %), whereas the 10 µl metal loop had the lowest sensitivity (64.2 %). For the 10⁴ CFU/ml cutoff value, 1 µl plastic loop inoculation demonstrated the highest sensitivity (75.9 %), while the 10 µl metal loop provided the lowest sensitivity (26.5 %). These results suggest that the single use plastic loops are functional, sensitive, useful especially for critical sample.
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Affiliation(s)
- Ayse Nur Ceylan
- Department of Medical Microbiology, Basaksehir Cam ve Sakura City Hospital, Başakşehir, Istanbul, Turkey.
| | - Ali Toprak
- Biostatistics, Bezmialem Vakif University Medical Faculty, Istanbul, Turkey
| | - Mehmet Ziya Doymaz
- Medical Microbiology, Bezmialem Vakif University Medical Faculty, Istanbul, Turkey
| | - Bilge Sümbül
- Medical Microbiology, Bezmialem Vakif University Medical Faculty, Istanbul, Turkey
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Moelleken M, Krimphove SH, Krefting F, Benson S, Rammos C, Cyrek AE, Dissemond J. How effective is simple mechanical wound debridement in reducing bacterial colonisation? Results of a prospective clinical study. Int Wound J 2024; 21:e14824. [PMID: 38512118 PMCID: PMC10956538 DOI: 10.1111/iwj.14824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 02/18/2024] [Accepted: 02/23/2024] [Indexed: 03/22/2024] Open
Abstract
BACKGROUND AND AIMS Bacteria in wounds can lead to stagnation of wound healing as well as to local or even systemic wound infections up to potentially lethal sepsis. Consequently, the bacterial load should be reduced as part of wound treatment. Therefore, the efficacy of simple mechanical wound debridement should be investigated in terms of reducing bacterial colonisation. PATIENTS AND METHODS Patients with acute or chronic wounds were assessed for bacterial colonisation with a fluorescence camera before and after mechanical wound debridement with sterile cotton pads. If bacterial colonisation persisted, a second, targeted wound debridement was performed. RESULTS A total of 151 patients, 68 (45.0%) men and 83 (55.0%) women were included in this study. The male mean age was 71.0 years and the female 65.1 years. By establishing a new analysis method for the image files, we could document that the bacterial colonised areas were distributed 21.9% on the wound surfaces, 60.5% on the wound edges (up to 0.5 cm) and 17.6% on the wound surroundings (up to 1.5 cm). One mechanical debridement achieved a significant reduction of bacterial colonised areas by an average of 29.6% in the wounds, 18.9% in the wound edges and 11.8% in the wound surroundings and was increased by performing it a second time. CONCLUSIONS It has been shown that even a simple mechanical debridement with cotton pads can significantly reduce bacterial colonisation without relevant side effects. In particular, the wound edges were the areas that were often most contaminated with bacteria and should be included in the debridement with special attention. Since bacteria remain in wounds after mechanical debridement, it cannot replace antimicrobial therapy strategies, but offer a complementary strategy to improve wound care. Thus, it could be shown that simple mechanical debridement is effective in reducing bacterial load and should be integrated into a therapeutic approach to wounds whenever appropriate.
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Affiliation(s)
- Maurice Moelleken
- Department of Dermatology, Venerology and AllergologyUniversity Hospital of EssenEssenGermany
| | | | - Frederik Krefting
- Department of Dermatology, Venerology and AllergologyUniversity Hospital of EssenEssenGermany
| | - Sven Benson
- University Hospital of Essen, Institute of Medical Psychology and Behavioral Immunobiology, Institute of Medical Education, Centre for Translational Neuro‐ and Behavioral SciencesEssenGermany
| | - Christos Rammos
- Department of Cardiology and AngiologyUniversity Hospital of EssenEssenGermany
| | - Anna Ewa Cyrek
- Division of Vascular and Endovascular Surgery, Department of General, Visceral and Transplant SurgeryUniversity Hospital of EssenEssenGermany
| | - Joachim Dissemond
- Department of Dermatology, Venerology and AllergologyUniversity Hospital of EssenEssenGermany
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Kayaardı S, Uyarcan M, Atmaca I, Yıldız D, Benzer Gürel D. Effect of non-thermal ultraviolet and ultrasound technologies on disinfection of meat preparation equipment in catering industry. FOOD SCI TECHNOL INT 2024; 30:282-289. [PMID: 36632027 DOI: 10.1177/10820132221151097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
In recent years, ultraviolet and ultrasound treatments are gaining attraction as promising green decontamination technologies to ensure microbial safety in food industry. Decontamination by ultraviolet light is a physical process defined by the transfer of electromagnetic energy from a light source to an organism's cellular material and depended on the emission of radiation in the ultraviolet region (100-400 nm), specifically the UV-C region (200-280 nm) which has been demonstrated to be germicidal. Ultrasound technology is defined as sound waves with high and low frequency beyond the limit of human hearing and shows a decontamination effect that occurs as a consequence of cavitation at high power (low frequency) in general. In the present study, it was aimed to determine the effectiveness of ultraviolet light (254 nm, 10 min) and high frequency ultrasound techniques (40 kHz, 10 min) in reducing total aerobic mesophilic bacteria, yeast and mold, Esherichia coli/coliform and Salmonella spp. on the equipment surfaces used in the catering facility. For this purpose, the equipment (cutting knife, meat grinder knife, knife sharpener, cut-proof glove) used in the meat preparation department of catering facility were selected for the treatments. According to the results, appreciable reductions were achieved in total aerobic mesophilic bacterial counts of the ultraviolet treated samples (maximum difference 2.61 log cfu/cm2) and the ultrasound treated samples (maximum difference 4.07 log cfu/cm2). After ultraviolet treatment, Salmonella spp. were totally inhibited on the contaminated surfaces. Furthermore, Escherichia coli/coliform was not detected in the samples after both treatments whereas it was detected before the treatments. It has been concluded that the techniques are effective in reducing microbiological load and also ultraviolet treatment is effective on pathogenic microorganisms on food contact surfaces. As a result, the ultraviolet and ultrasound techniques are effective treatments for equipment disinfection in the catering sector and can be used industrially as it gives successful results.
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Affiliation(s)
- Semra Kayaardı
- Engineering Faculty, Department of Food Engineering, Manisa Celal Bayar University, Manisa, Turkey
| | - Müge Uyarcan
- Engineering Faculty, Department of Food Engineering, Manisa Celal Bayar University, Manisa, Turkey
| | - Işıl Atmaca
- Engineering Faculty, Department of Food Engineering, Manisa Celal Bayar University, Manisa, Turkey
| | - Dilay Yıldız
- Engineering Faculty, Department of Food Engineering, Manisa Celal Bayar University, Manisa, Turkey
| | - Duygu Benzer Gürel
- Engineering Faculty, Department of Food Engineering, Manisa Celal Bayar University, Manisa, Turkey
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Musisi E, Wamutu S, Ssengooba W, Kasiinga S, Sessolo A, Sanyu I, Kaswabuli S, Zawedde J, Byanyima P, Kia P, Muwambi W, Toskin DT, Kigozi E, Walbaum N, Dombay E, Legrady MB, Ssemambo KDM, Joloba M, Kuchaka D, Worodria W, Huang L, Gillespie SH, Sabiiti W. Accuracy of the tuberculosis molecular bacterial load assay to diagnose and monitor response to anti-tuberculosis therapy: a longitudinal comparative study with standard-of-care smear microscopy, Xpert MTB/RIF Ultra, and culture in Uganda. Lancet Microbe 2024; 5:e345-e354. [PMID: 38458206 DOI: 10.1016/s2666-5247(23)00367-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 09/18/2023] [Accepted: 10/31/2023] [Indexed: 03/10/2024]
Abstract
BACKGROUND In 2018, the tuberculosis molecular bacterial load assay (TB-MBLA), a ribosomal RNA-based test, was acknowledged by WHO as a molecular assay that could replace smear microscopy and culture for monitoring tuberculosis treatment response. In this study, we evaluated the accuracy of TB-MBLA for diagnosis and monitoring of treatment response in comparison with standard-of-care tests. METHODS For this longitudinal prospective study, patients aged 18 years or older with presumptive tuberculosis (coughing for at least 2 weeks, night sweats, and weight loss) were enrolled at China-Uganda Friendship Hospital Naguru (Kampala, Uganda). Participants were evaluated for tuberculosis by TB-MBLA in comparison with Xpert MTB/RIF Ultra (Xpert-Ultra) and smear microscopy, with Mycobacteria Growth Indicator Tube (MGIT) culture as a reference test. Participants who were positive on Xpert-Ultra were enrolled on a standard 6-month anti-tuberculosis regimen, and monitored for treatment response at weeks 2, 8, 17, and 26 after initiation of treatment and then 3 months after treatment. FINDINGS Between Nov 15, 2019, and June 15, 2022, 210 participants (median age 35 years [IQR 27-44]) were enrolled. 135 (64%) participants were male and 72 (34%) were HIV positive. The pretreatment diagnostic sensitivities of TB-MBLA and Xpert-Ultra were similar (both 99% [95% CI 95-100]) but the specificity was higher for TB-MBLA (90% [83-96]) than for Xpert-Ultra (78% [68-86]). Ten participants were Xpert-Ultra trace positive, eight (80%) of whom were negative by TB-MBLA and MGIT culture. Smear microscopy had lower diagnostic sensitivity (75% [65-83]) but higher specificity (98% [93-100]) than TB-MBLA and Xpert-Ultra. Among participants who were smear microscopy negative, the sensitivity of TB-MBLA was 96% (95 CI 80-100) and was 100% (95% CI 86-100) in those who were HIV positive. 129 (61%) participants were identified as tuberculosis positive by Xpert-Ultra and these individuals were enrolled in the treatment group and monitored for treatment response. According to TB-MBLA, 19 of these patients cleared bacillary load to zero by week 2 of treatment and remained negative throughout the 6-month treatment follow-up. Positivity for tuberculosis decreased with treatment as measured by all tests, but the rate was slower with Xpert-Ultra. Consequently, 31 (33%) of 95 participants were still Xpert-Ultra positive at the end of treatment but were clinically well and negative on TB-MBLA and culture at 6 months of treatment. Two patients were still Xpert-Ultra positive with a further 3 months of post-treatment follow-up. The rate of conversion to negative of the DNA-based Xpert-Ultra was 3·3-times slower than that of the rRNA-based TB-MBLA. Consequently for the same patient, it would take 13 weeks and 52 weeks to reach complete tuberculosis negativity by TB-MBLA and Xpert-Ultra, respectively. Participants who were positive on smear microscopy at 8 weeks, who received an extra month of intensive treatment, had a similar TB-MBLA-measured bacillary load at 8 weeks to those who were smear microscopy negative. INTERPRETATION TB-MBLA has a similar performance to Xpert-Ultra for pretreatment diagnosis of tuberculosis, but is more accurate at detecting and characterising the response to treatment than Xpert-Ultra and standard-of-care smear microscopy. FUNDING European and Developing Countries Clinical Trials Partnership, Makerere University Research and Innovation Fund, US National Institutes of Health.
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Affiliation(s)
- Emmanuel Musisi
- Division of Infection and Global Health, School of Medicine, University of St Andrews, St Andrews, UK; Infectious Diseases Research Collaboration, Kampala, Uganda
| | - Samuel Wamutu
- Department of Biochemistry and Sports Sciences, Makerere University, Kampala, Uganda
| | - Willy Ssengooba
- BSL-3 Mycobacteriology Laboratory, Department of Medical Microbiology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala, Uganda; Medical and Molecular Laboratories (MML), Kampala, Uganda
| | | | | | - Ingvar Sanyu
- Infectious Diseases Research Collaboration, Kampala, Uganda
| | | | | | | | - Praiscillia Kia
- BSL-3 Mycobacteriology Laboratory, Department of Medical Microbiology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala, Uganda
| | - William Muwambi
- BSL-3 Mycobacteriology Laboratory, Department of Medical Microbiology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala, Uganda
| | - Divine Tracy Toskin
- BSL-3 Mycobacteriology Laboratory, Department of Medical Microbiology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala, Uganda
| | - Edgar Kigozi
- BSL-3 Mycobacteriology Laboratory, Department of Medical Microbiology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala, Uganda
| | - Natasha Walbaum
- Division of Infection and Global Health, School of Medicine, University of St Andrews, St Andrews, UK
| | - Evelin Dombay
- Division of Infection and Global Health, School of Medicine, University of St Andrews, St Andrews, UK
| | | | - Kizza David-Martin Ssemambo
- BSL-3 Mycobacteriology Laboratory, Department of Medical Microbiology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala, Uganda; Medical and Molecular Laboratories (MML), Kampala, Uganda
| | - Moses Joloba
- BSL-3 Mycobacteriology Laboratory, Department of Medical Microbiology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala, Uganda; Medical and Molecular Laboratories (MML), Kampala, Uganda
| | - Davis Kuchaka
- Kilimanjaro Clinical Research Institute, Kilimanjaro, Tanzania
| | | | - Laurence Huang
- Infectious Diseases Research Collaboration, Kampala, Uganda; Division of Pulmonary and Critical Care Medicine and Division of HIV, Infectious Diseases, and Global Medicine, University of California San Francisco, San Francisco, CA, USA
| | - Stephen H Gillespie
- Division of Infection and Global Health, School of Medicine, University of St Andrews, St Andrews, UK
| | - Wilber Sabiiti
- Division of Infection and Global Health, School of Medicine, University of St Andrews, St Andrews, UK.
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Chen M, Wan Q, Xu M, Chen Z, Guo S. Transcriptome Analysis of Host Anti-Vibrio harveyi Infection Revealed the Pathogenicity of V. harveyi to American Eel (Anguilla rostrata). Mar Biotechnol (NY) 2024; 26:306-323. [PMID: 38367180 DOI: 10.1007/s10126-024-10298-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Accepted: 02/12/2024] [Indexed: 02/19/2024]
Abstract
Vibrio harveyi, a recently discovered pathogenic bacterium isolated from American eels (Anguilla rostrata), poses uncertainties regarding its pathogenesis in American eel and the molecular mechanisms underlying host defense against V. harveyi infection. This study aimed to determine the LD50 of V. harveyi in American eel and assess the bacterial load in the liver, spleen, and kidney post-infection with the LD50 dose. The results showed that the LD50 of V. harveyi via intraperitoneal injection in American eels over a 14d period was determined to be 1.24 × 103 cfu/g body weight (6.2 × 104 cfu/fish). The peak bacterial load occurred at 36 h post-infection (hpi) in all three organs examined. Histopathology analysis revealed hepatic vein congestion and thrombi, tubular vacuolar degeneration, and splenic bleeding. Moreover, quantitative reverse transcription polymerase chain reaction (qRT-PCR) results indicated significant up or downregulation of 18 host immune- or anti-infection-related genes post 12 to 60 hpi following the infection. Additionally, RNA sequencing (RNA-seq) unveiled 7 hub differentially expressed genes (DEGs) and 11 encoded proteins play crucial roles in the anti-V. harveyi response in American eels. This study firstly represents the comprehensive report on the pathogenicity of V. harveyi to American eels and RNA-seq of host's response to V. harveyi infection. These findings provide valuable insights into V. harveyi pathogenesis and the strategies employed by the host's immune system at the transcriptomic level to combat V. harveyi infection.
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Affiliation(s)
- Minxia Chen
- Fisheries College, Jimei University, Xiamen, 361021, China
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, 361021, China
- State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, Xiamen, 361021, China
| | - Qijuan Wan
- Fisheries College, Jimei University, Xiamen, 361021, China
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, 361021, China
- State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, Xiamen, 361021, China
| | - Ming Xu
- Fisheries College, Jimei University, Xiamen, 361021, China
- State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, Xiamen, 361021, China
| | - Zihao Chen
- Fisheries College, Jimei University, Xiamen, 361021, China
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, 361021, China
| | - Songlin Guo
- Fisheries College, Jimei University, Xiamen, 361021, China.
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, 361021, China.
- State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, Xiamen, 361021, China.
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Dou X, Zhang Z, Li C, Du Y, Tian F. A novel nanoparticle-based fluorescent sandwich immunoassay for specific detection of Salmonella Typhimurium. Int J Food Microbiol 2024; 413:110593. [PMID: 38308876 DOI: 10.1016/j.ijfoodmicro.2024.110593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 01/16/2024] [Accepted: 01/19/2024] [Indexed: 02/05/2024]
Abstract
The diseases caused by foodborne pathogens have a serious impact on human health and social stability. Conventional detection methods can involve long assay times and complex pretreatment steps, making them unsuitable for rapid, large-scale analysis of food samples. We constructed a novel nano-fluorescence sandwich immunosorbent immunoassay (nano-FSIA) to rapidly detect Salmonella Typhimurium in food, based on strong covalent binding between streptavidin and biotin. We used antibodies coupled to large particle-size fluorescent microspheres as fluorescent probes for direct quantitative analysis of S. typhimurium in milk. The optimized parameters were determined, and specificity and sensitivity were validated in phosphate-buffered saline (PBS) and milk. The results demonstrated a wide dynamic detection range for S. typhimurium (103-108 colony forming units [CFU]/mL), with the limit of detection in PBS and milk at 234 and 346 CFU/mL, respectively. The results of nano-FSIA were consistent with those of plate counts and enzyme-linked immunosorbent assays, providing an effective and promising single-bacterium counting method for the rapid detection of Salmonella.
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Affiliation(s)
- Xuechen Dou
- Systems Engineering Institute, Academy of Military Sciences, People's Liberation Army, Tianjin 30161, China
| | - Zhiwei Zhang
- Systems Engineering Institute, Academy of Military Sciences, People's Liberation Army, Tianjin 30161, China
| | - Chao Li
- Systems Engineering Institute, Academy of Military Sciences, People's Liberation Army, Tianjin 30161, China; National Bio-Protection Engineering Center, Tianjin 300161, China
| | - Yaohua Du
- Systems Engineering Institute, Academy of Military Sciences, People's Liberation Army, Tianjin 30161, China; National Bio-Protection Engineering Center, Tianjin 300161, China.
| | - Feng Tian
- Systems Engineering Institute, Academy of Military Sciences, People's Liberation Army, Tianjin 30161, China.
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9
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Koele SE, Dorlo TPC, Upton CM, Aarnoutse RE, Svensson EM. Power to identify exposure-response relationships in phase IIa pulmonary tuberculosis trials with multi-dimensional bacterial load modeling. CPT Pharmacometrics Syst Pharmacol 2024; 13:374-385. [PMID: 38102814 PMCID: PMC10941589 DOI: 10.1002/psp4.13089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 10/04/2023] [Accepted: 11/15/2023] [Indexed: 12/17/2023] Open
Abstract
Adequate power to identify an exposure-response relationship in a phase IIa clinical trial for pulmonary tuberculosis (TB) is important for dose selection and design of follow-up studies. Currently, it is not known what response marker provides the pharmacokinetic-pharmacodynamic (PK-PD) model more power to identify an exposure-response relationship. We simulated colony-forming units (CFU) and time-to-positivity (TTP) measurements for four hypothetical drugs with different activity profiles for 14 days. The power to identify exposure-response relationships when analyzing CFU, TTP, or combined CFU + TTP data was determined at 60 total participants, or with 25 out of 60 participants in the lowest and highest dosing groups (unbalanced design). For drugs with moderate bactericidal activity, power was low (<59%), irrespective of the data analyzed. Power was 1.9% to 29.4% higher when analyzing TTP data compared to CFU data. Combined analysis of CFU and TTP further improved the power, on average by 4.2%. For a drug with a medium-high activity, the total sample size needed to achieve 80% power was 136 for CFU, 72 for TTP, and 68 for combined CFU + TTP data. The unbalanced design improved the power by 16% over the balanced design. In conclusion, the power to identify an exposure-response relationship is low for TB drugs with moderate bactericidal activity or with a slow onset of activity. TTP provides the PK-PD model with more power to identify exposure-response relationships compared to CFU, and combined analysis or an unbalanced dosing group study design offers modest further improvement.
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Affiliation(s)
- Simon E. Koele
- Department of Pharmacy, Radboudumc Research Institute for Medical Innovation (RIMI)Radboud University Medical CenterNijmegenThe Netherlands
| | | | | | - Rob E. Aarnoutse
- Department of Pharmacy, Radboudumc Research Institute for Medical Innovation (RIMI)Radboud University Medical CenterNijmegenThe Netherlands
| | - Elin M. Svensson
- Department of Pharmacy, Radboudumc Research Institute for Medical Innovation (RIMI)Radboud University Medical CenterNijmegenThe Netherlands
- Department of PharmacyUppsala UniversityUppsalaSweden
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10
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Ogaya C, Huong N, Touceda-González M, Barg M, Dörfler V, Ehlers RU, Molina C. Monitoring the Photorhabdus spp. bacterial load in Heterorhabditis bacteriophora dauer juveniles over different storage times and temperatures: A molecular approach. J Invertebr Pathol 2024; 203:108048. [PMID: 38159796 DOI: 10.1016/j.jip.2023.108048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/22/2023] [Accepted: 12/27/2023] [Indexed: 01/03/2024]
Abstract
Biological control products based on the entomopathogenic nematode Heterorhabditis bacteriophora can vary in virulence (quality). The influence of their symbiotic bacteria Photorhabdus spp. inside the infective dauer juvenile (DJ) on DJ quality has not received much attention in the past. The presence of the bacteria in the DJ is crucial for its biocontrol potential. This investigation provides a method to quantify the bacterial load inside the DJ based on a qPCR technique. Information from the genome of Photorhabdus laumondii strain DE2 was used to identify single copy genes with no homology to any other bacterial accessions. One gene (hereby named CG2) was selected for primers design and for further qPCR experiments. Cross-amplification tests with P. thracensis and P. kayaii, also symbionts of H. bacteriophora, were positive, whereas no amplicons were produced for P. temperata or Xenorhabdus nematophila. We tested our qPCR system in DJ populations carrying defined proportions of bacteria-free (axenic) vs bacteria-carrying nematodes. With an increasing proportion of axenic DJ in a population, virulence declined, and the virulence was proportional to the amount of bacterial DNA detected in the population by qPCR. Along liquid storage over long time, virulence also decreased, and this factor correlated with the reduction of bacterial DNA on the respective DJ population. We observed that stored DJ kept virulent up to 90 days and thereafter the virulence as well as the amount of bacterial DNA drastically decreased. Storage temperature also influenced the bacterial survival. Inside formulated DJ, the loss of bacterial DNA on the DJ population was accelerated under storage temperatures below 7.5 °C, suggesting that reproduction of the bacterial cells takes place when growth temperature is favorable. The role of bacterial survival inside stored DJ can now be adequately addressed using this molecular quality-control technique.
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Affiliation(s)
- Christopher Ogaya
- Faculty of Agricultural and Nutritional Sciences, Christian-Albrechts-University Kiel, Hermann-Rodewald-Str. 4, 24118 Kiel, Germany; e-nema GmbH, Klausdorfer Str. 28-36, 24223 Schwentinental, Germany
| | - Nontarak Huong
- Department of Biology, Ghent University, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | | | - Mike Barg
- e-nema GmbH, Klausdorfer Str. 28-36, 24223 Schwentinental, Germany
| | - Verena Dörfler
- e-nema GmbH, Klausdorfer Str. 28-36, 24223 Schwentinental, Germany
| | - Ralf-Udo Ehlers
- Faculty of Agricultural and Nutritional Sciences, Christian-Albrechts-University Kiel, Hermann-Rodewald-Str. 4, 24118 Kiel, Germany; Department of Biology, Ghent University, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Carlos Molina
- e-nema GmbH, Klausdorfer Str. 28-36, 24223 Schwentinental, Germany.
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11
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van Dessel HA, Dirks JAMC, van Loo IHM, van der Veer BMJW, Hoebe CJPA, Dukers-Muijrers NHTM, Savelkoul PHM, Wolffs P. Higher Neisseria gonorrhoeae bacterial load in coinfections with Chlamydia trachomatis compared with Neisseria gonorrhoeae single infections does not lead to more symptoms. Sex Transm Infect 2024; 100:127-128. [PMID: 38050169 DOI: 10.1136/sextrans-2023-055977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 11/17/2023] [Indexed: 12/06/2023] Open
Affiliation(s)
- Helke A van Dessel
- Department of Medical Microbiology, Infectious Diseases and Infection Prevention, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center+, Maastricht, Netherlands
| | - Jeanne A M C Dirks
- Department of Medical Microbiology, Infectious Diseases and Infection Prevention, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center+, Maastricht, Netherlands
| | - Inge H M van Loo
- Department of Medical Microbiology, Infectious Diseases and Infection Prevention, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center+, Maastricht, Netherlands
| | - Brian M J W van der Veer
- Department of Medical Microbiology, Infectious Diseases and Infection Prevention, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center+, Maastricht, Netherlands
| | - Christian J P A Hoebe
- Department of Medical Microbiology, Infectious Diseases and Infection Prevention, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center+, Maastricht, Netherlands
- Living Lab Public Health Mosa, Department of Sexual Health, Infectious Diseases and Environmental Health, Public Health Service South Limburg, Heerlen, Netherlands
| | - Nicole H T M Dukers-Muijrers
- Living Lab Public Health Mosa, Department of Sexual Health, Infectious Diseases and Environmental Health, Public Health Service South Limburg, Heerlen, Netherlands
- Department of Health Promotion, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, Netherlands
| | - Paul H M Savelkoul
- Department of Medical Microbiology, Infectious Diseases and Infection Prevention, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center+, Maastricht, Netherlands
| | - Petra Wolffs
- Department of Medical Microbiology, Infectious Diseases and Infection Prevention, Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Center+, Maastricht, Netherlands
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12
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Katsarou EI, Reid N, Lianou DT, Fthenakis GC. Stress related to wild canid predators near dairy sheep farms associated with increased somatic cell counts in bulk-tank milk. Sci Rep 2024; 14:3252. [PMID: 38331991 PMCID: PMC10853181 DOI: 10.1038/s41598-024-53887-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 02/06/2024] [Indexed: 02/10/2024] Open
Abstract
We investigated the association between wild canid predators reported near sheep farms throughout Greece and somatic cell counts in bulk-tank milk as a reflection of milk quality. The study included 325 dairy sheep flocks, where bulk-tank milk somatic cell counts and total bacterial counts were measured and staphylococci were isolated. Farms were divided into three groups: Cohort A (farms with no reports of wild canid predators nearby), B (farms with canid predators (golden jackal and grey wolf) nearby yet with no experience of livestock losses to predation) and C (farms with canid predators nearby and livestock losses to predation). Somatic cell counts in bulk-tank milk of Cohort C farms were significantly higher, + 43% and + 29%, compared to those for Cohorts A and B, respectively: 0.617 × 106 cells mL-1 versus 0.433 × 106 or 0.477 × 106 cells mL-1, respectively. The presence of wild canid predators near sheep farms was associated with lower quality milk potentially indicative of stress consistent with the potential effects of a landscape of fear. Increasing biosecurity measures at livestock farms, e.g., fencing, and presence of livestock guard dogs could minimise predation risk, whilst also improving livestock welfare by reducing predator-associated stress.
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Affiliation(s)
- Eleni I Katsarou
- Veterinary Faculty, University of Thessaly, 43100, Karditsa, Greece
| | - Neil Reid
- Institute for Global Food Security (IGFS), School of Biological Sciences, Queen's University Belfast, Belfast, BT9 5DL, UK
| | - Daphne T Lianou
- Veterinary Faculty, University of Thessaly, 43100, Karditsa, Greece
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13
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Aguiar Cabrera EM, Barroso Rosa S, Ojeda Vargas MDM, Hernández Flores CN, Hernández Costa EM. A single plain ring is not associated with increased bacterial load on hands: An experimental study among healthcare worker students undertaking mock surgery. Infect Dis Health 2024; 29:51-60. [PMID: 37993309 DOI: 10.1016/j.idh.2023.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/06/2023] [Accepted: 10/12/2023] [Indexed: 11/24/2023]
Abstract
BACKGROUND Adequate hand hygiene is considered as one of the most effective strategies in healthcare-related infection prevention. The potential negative effect of rings in hand disinfection and thus, in increased nosocomial infections rates is still controversial. Therefore, the present study was designed with the purpose of examining if rings frequently exposed to surgical scrubbing were associated or not with increased bacterial counts. METHODS 32 volunteers were randomized into 4 groups: A (no rings), B (participants wore a ring), C (no rings and performed surgical scrubbing with chlorhexidine every 48 h) and D (participants wore a ring and performed surgical scrubbing every 48 h). Glove juice samples were obtained at day 0 (T0) and after a 90-min mock-surgery on day 14 (T1). Quantitative (number of UFC/mL) and qualitative data (microorganism type) were collected as study variables. RESULTS All groups were comparable at T0. All ring carriers obtained negative cultures at T1. Ring presence was not associated with higher bacterial counts; comparisons between A vs B groups and C vs D groups showed no statistically significant differences (p = 0.076 and 1.000). T1 negative cultures were more frequent in participants performing surgical scrubbing every second day (93.8 % vs 75 %), although this difference did not reach statistical significance (p = 0.332). CONCLUSIONS The presence of single plain ring does not seem to be associated with an increased hand bacterial load. Regular surgical scrubbing with chlorhexidine impregnated sponges reduces bacterial contamination of hands, even in the presence of plain rings.
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Affiliation(s)
- Eva María Aguiar Cabrera
- Universidad de Las Palmas de Gran Canaria, Medical and Surgical Sciences Department, Las Palmas de Gran Canaria, Spain.
| | - Sergio Barroso Rosa
- Universidad de Las Palmas de Gran Canaria, Medical and Surgical Sciences Department, Las Palmas de Gran Canaria, Spain; Complejo Hospitalario Universitario Insular Materno Infantil de Gran Canaria, Orthopaedic Surgery Department, Las Palmas de Gran Canaria, Spain; The Orthopaedic Research Institute of Queensland, Pimlico, Australia.
| | - María Del Mar Ojeda Vargas
- Universidad de Las Palmas de Gran Canaria, Clinical Sciences Department, Las Palmas de Gran Canaria, Spain; Complejo Hospitalario Universitario Insular Materno Infantil de Gran Canaria, Microbiology Department, Las Palmas de Gran Canaria, Spain.
| | | | - Elena María Hernández Costa
- Complejo Hospitalario Universitario Insular Materno Infantil de Gran Canaria, Surgical Area, Las Palmas de Gran Canaria, Spain.
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14
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Gonzalez-Castro RA, Peña FJ, Herickhoff LA. Spermatozoa cooled to 5°C one day after collection from porcine commercial semen doses retain sperm functionality with reduced bacterial load. Andrology 2024; 12:186-197. [PMID: 37058577 DOI: 10.1111/andr.13441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 04/08/2023] [Accepted: 04/10/2023] [Indexed: 04/16/2023]
Abstract
BACKGROUND Commercial porcine semen is stored at 17°C, leading to a reduction of sperm quality and increase of bacterial growth. OBJECTIVES To evaluate the effect of 5°C storage on porcine sperm functionality cooled one day after collection. MATERIALS AND METHODS Semen doses (n = 40) were transported at 17°C and cooled at 5°C one day after collection. Spermatozoa were evaluated at Days 1, 4, and 7 for motility, viability, acrosome integrity, membrane stability, intracellular zinc, oxidative stress, and bacterial growth. RESULTS Contaminated semen doses predominantly exhibited Serratia marcescens, with increasing bacterial load during 17°C storage. Under hypothermal storage, negative doses for bacteria growth at Day 1 remained negative, and bacterial load did not increase in bacterial contaminated samples. Motility was significantly reduced through 17°C storage, but at 5°C, motility was only reduced at Day 4. Samples with bacterial growth (35.0%, 14/40) had significantly reduced motility at 17°C, but motility was unaltered at 5°C. Plasma membrane and acrosome integrity without bacterial contamination were unaffected at 17°C, but were significantly reduced at 5°C on Day 7. Plasma membrane and acrosome integrity significantly decreased with bacterial contamination regardless of temperature. High mitochondrial activity in viable spermatozoa without bacteria was not altered by temperature, but was significantly reduced by bacterial contamination at 17°C. Membrane stability was significantly reduced at Day 4, but tended (p = 0.07) to be higher in samples without bacterial growth. Viable spermatozoa exhibiting high zinc were significantly reduced throughout storage regardless of temperature. Oxidative stress levels were not altered, but significantly increased with bacterial contamination at 17°C. DISCUSSION AND CONCLUSION Porcine spermatozoa cooled to 5°C one day after collection retain functional attributes similar to spermatozoa stored at 17°C, but have a reduced bacterial load. Cooling extended boar semen to 5°C is feasible after transport to avoid modifying semen production.
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Affiliation(s)
- Raul A Gonzalez-Castro
- Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, USA
- Membrane Protective Technologies Inc., Fort Collins, Colorado, USA
| | - Fernando J Peña
- Department of Animal Medicine, Laboratory of Equine Reproduction and Equine Spermatology, Veterinary Teaching Hospital, University of Extremadura, Caceres, Spain
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15
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Alonso-Calleja C, Castaño-Arriba A, Riesco-Peláez F, Capita R. Effect of trisodium phosphate, ascorbic acid and lactic acid on bacterial load, sensorial characteristics and instrumental colour of rabbit meat. Meat Sci 2024; 207:109349. [PMID: 37866235 DOI: 10.1016/j.meatsci.2023.109349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 08/06/2023] [Accepted: 09/25/2023] [Indexed: 10/24/2023]
Abstract
The effect of 8% trisodium phosphate (TSP), 2% ascorbic acid (AA) and 2% lactic acid (LA) on microbial load, pH values, sensorial characteristics and instrumental colour of rabbit shoulders was determined. Measurements were performed immediately after dipping (Day 0) and every 24 h over seven days of storage at 7 °C. The microorganisms present naturally (total aerobic counts, TACs) and the levels of artificially inoculated pathogenic bacteria were studied. Microbial contamination showed a trend towards lower values on decontaminated samples than on control (water-dipped) samples from Day 1 of storage onwards. Average TACs (log10 cfu/cm2) throughout storage were higher (P < 0.05) on control samples (5.94 ± 2.06) than on decontaminated ones (3.69 ± 1.75, 3.77 ± 2.01, and 3.10 ± 1.85 on TSP-, AA-, and LA-treated samples, respectively). On the basis of TACs, all the decontaminants allowed the shelf-life of rabbit meat to be extended from Day 4 to Day 7. From the viewpoint of sensory scores, no treatment achieved any prolongation of the shelf-life of rabbit meat, which was 6 days (control and TSP-treated samples), 5 days (AA) or one day (LA). LA reduced (P < 0.05) scores for colour, odour and overall acceptability from Day 0 of storage, since these samples presented whitening and a slight acid smell. Treatments with organic acids increased lightness (L*), and TSP brought a reduction in redness (b*), vividness (C*) and hue angle (h) values with respect to controls. This research work offers new insights into the chemical decontamination of rabbit meat.
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Affiliation(s)
- Carlos Alonso-Calleja
- Department of Food Hygiene and Technology, Veterinary Faculty, University of León, E-24071 León, Spain; Institute of Food Science and Technology, University of León, E-24071 León, Spain
| | - Ana Castaño-Arriba
- Department of Food Hygiene and Technology, Veterinary Faculty, University of León, E-24071 León, Spain; Institute of Food Science and Technology, University of León, E-24071 León, Spain
| | - Félix Riesco-Peláez
- Department of Electrical Engineering and Systems and Automation, School of Industrial, Computer and Aerospace Engineering, University of León, E-24071 León, Spain
| | - Rosa Capita
- Department of Food Hygiene and Technology, Veterinary Faculty, University of León, E-24071 León, Spain; Institute of Food Science and Technology, University of León, E-24071 León, Spain.
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Rux C, Wittmer A, Stork A, Vach K, Hellwig E, Cieplik F, Al-Ahmad A. Optimizing the use of low-frequency ultrasound for bacterial detachment of in vivo biofilms in dental research-a methodological study. Clin Oral Investig 2023; 28:19. [PMID: 38141103 DOI: 10.1007/s00784-023-05397-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023]
Abstract
OBJECTIVES Low-frequency, low-intensity ultrasound is commonly utilized in various dental research fields to remove biofilms from surfaces, but no clear recommendation exists in dental studies so far. Therefore, this study aims to optimize the sonication procedure for the dental field to efficiently detach bacteria while preserving viability. MATERIALS AND METHODS Initial biofilm was formed in vivo on bovine enamel slabs (n = 6) which were worn by four healthy participants for 4 h and 24 h. The enamel slabs covered with biofilm were then ultrasonicated ex vivo for various time periods (0, 1, 2, 4, 6 min). Colony-forming units were determined for quantification, and bacteria were identified using MALDI-TOF. Scanning electron microscopic images were taken to also examine the efficiency of ultrasonications for different time periods. RESULTS Ultrasonication for 1 min resulted in the highest bacterial counts, with at least 4.5-fold number compared to the non-sonicated control (p < 0.05). Most bacteria were detached within the first 2 min of sonication, but there were still bacteria detached afterwards, although significantly fewer (p < 0.0001). The highest bacterial diversity was observed after 1 and 2 min of sonication (p < 0.03). Longer sonication periods negatively affected bacterial counts of anaerobes, Gram-negative bacteria, and bacilli. Scanning electron microscopic images demonstrated the ability of ultrasound to desorb microorganisms, as well as revealing cell damage and remaining bacteria. CONCLUSIONS With the use of low-frequency, low-intensity ultrasound, significantly higher bacterial counts and diversity can be reached. A shorter sonication time of 1 min shows the best results overall. CLINICAL RELEVANCE This standardization is recommended to study initial oral biofilms aged up to 24 h to maximize the outcome of experiments and lead to better comparability of studies.
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Affiliation(s)
- Cassandra Rux
- Department of Operative Dentistry and Periodontology, Medical Center, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany
| | - Annette Wittmer
- Institute of Medical Microbiology and Hygiene, Faculty of Medicine, University of Freiburg, Hermann-Herder- Str. 11, 79104, Freiburg, Germany
| | - Anja Stork
- Department of Operative Dentistry and Periodontology, Medical Center, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany
| | - Kirstin Vach
- Institute for Medical Biometry and Statistics, Faculty of Medicine, University of Freiburg, Stefan-Meier-Str. 26, 79104, Freiburg, Germany
| | - Elmar Hellwig
- Department of Operative Dentistry and Periodontology, Medical Center, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany
| | - Fabian Cieplik
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany
| | - Ali Al-Ahmad
- Department of Operative Dentistry and Periodontology, Medical Center, Faculty of Medicine, University of Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany.
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Ghosh C, Das MC, Acharjee S, Bhattacharjee S, Sandhu P, Kumari M, Bhowmik J, Ghosh R, Banerjee B, De UC, Akhter Y, Bhattacharjee S. Combating Staphylococcus aureus biofilm formation: the inhibitory potential of tormentic acid and 23-hydroxycorosolic acid. Arch Microbiol 2023; 206:25. [PMID: 38108905 DOI: 10.1007/s00203-023-03762-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 11/07/2023] [Accepted: 11/19/2023] [Indexed: 12/19/2023]
Abstract
Plant extracts have been used to treat microbiological diseases for centuries. This study examined plant triterpenoids tormentic acid (TA) and 23-hydroxycorosolic acid (HCA) for their antibiofilm effects on Staphylococcus aureus strains (MTCC-96 and MTCC-7405). Biofilms are bacterial colonies bound by a matrix of polysaccharides, proteins, and DNA, primarily impacting healthcare. As a result, ongoing research is being conducted worldwide to control and prevent biofilm formation. Our research showed that TA and HCA inhibit S. aureus planktonic growth by depolarizing the bacterial membrane. In addition, zone of inhibition studies confirmed their effectiveness, and crystal violet staining and biofilm protein quantification confirmed their ability to prevent biofilm formation. TA and HCA exhibited substantial reductions in biofilm formation for S. aureus (MTCC-96) by 54.85% and 48.6% and for S. aureus (MTCC-7405) by 47.07% and 56.01%, respectively. Exopolysaccharide levels in S. aureus biofilm reduced significantly by TA (25 μg/mL) and HCA (20 μg/mL). Microscopy, bacterial motility, and protease quantification studies revealed their ability to reduce motility and pathogenicity. Furthermore, TA and HCA treatment reduced the mRNA expression of S. aureus virulence genes. In silico analysis depicted a high binding affinity of triterpenoids for biofilm and quorum-sensing associated proteins in S. aureus, with TA having the strongest affinity for TarO (- 7.8 kcal/mol) and HCA for AgrA (- 7.6 kcal/mol). TA and HCA treatment reduced bacterial load in S. aureus-infected peritoneal macrophages and RAW264.7 cells. Our research indicates that TA and HCA can effectively combat S. aureus by inhibiting its growth and suppressing biofilm formation.
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Affiliation(s)
- Chinmoy Ghosh
- Department of Molecular Biology & Bioinformatics, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India
- School of Biotechnology, KIIT University, Bhubaneswar, Odisha, 751024, India
| | - Manash C Das
- Department of Molecular Biology & Bioinformatics, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India
| | - Shukdeb Acharjee
- Department of Molecular Biology & Bioinformatics, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India
| | - Samadrita Bhattacharjee
- Department of Molecular Biology & Bioinformatics, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India
| | - Padmani Sandhu
- Centre for Computational Biology and Bioinformatics, School of Life Sciences, Central University of Himachal Pradesh, Shahpur, Kangra, Himachal Pradesh, 176206, India
| | - Monika Kumari
- Centre for Computational Biology and Bioinformatics, School of Life Sciences, Central University of Himachal Pradesh, Shahpur, Kangra, Himachal Pradesh, 176206, India
| | - Joyanta Bhowmik
- Department of Chemistry, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India
| | - Ranjit Ghosh
- Department of Chemistry, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India
| | | | - Utpal Chandra De
- Department of Chemistry, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India
| | - Yusuf Akhter
- Department of Biotechnology, Babasaheb Bhimrao Ambedkar University, Vidya Vihar, Raebareli Road, Lucknow, Uttar Pradesh, India
| | - Surajit Bhattacharjee
- Department of Molecular Biology & Bioinformatics, Tripura University (A Central University), Suryamaninagar, Tripura, 799022, India.
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18
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Abdullah LA, Hashim N, Rehman MM, Elhaj MH, Mukhtar MM, Gismalla BG. Effectiveness of Diode (810 nm) Laser in Periodontal Parameters and Reduction of Subgingival Bacterial Load in Periodontitis Patients. J Contemp Dent Pract 2023; 24:1008-1015. [PMID: 38317400 DOI: 10.5005/jp-journals-10024-3603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
AIM This split-mouth randomized trial (RCT) aimed to assess the effect of diode laser on the clinical parameters in patients with periodontitis, compare the results with scaling and root planing (SRP) alone, and assess the implications of diode laser (DL) on plaque bacteria. MATERIALS AND METHODS Seventeen periodontitis patients were randomly assigned into two equal groups based on the therapy delivered. Group I (control site) received just SRP at baseline, while group II (test site) received both SRP and DL irradiation. For both groups, the clinical periodontal parameters probing pocket depth (PPD), and clinical attachment level (CAL) were measured at baseline, 30 days, and 90 days. Microbiological amount was also measured at baseline, 30, and 90 days after periodontal treatment. The amounts of Aggregatibacter actinomycetemcomitans (A.a), Prevotella intermedia (Pr. intermedia), and Porphyromonas gingivalis (P. gingivalis) were determined using real-time PCR probing with specific bacterial primers. RESULTS In both groups, PPD and CAL showed statistically significant reductions at different time intervals (p < 0.05). No significant difference were observed in CAL values after 1 and 3 months in both test and control groups (p > 0.05). The mean values of the concentration of A.a, Pr. intermedia and P. gingivalis were lower in the case group as compared to the control group and the difference was statistically significant after 1 month (*p = 0.001). CLINICAL SIGNIFICANCE According to this study, non-invasive laser treatment has the potential to improve clinical outcomes by lowering the quantity of A.a, Pr. intermedia and P. gingivalis. CONCLUSION In both groups, a considerable decrease in the periodontal pathogens A.a, Pr. intermedia and P. gingivalis were discovered; however, the intergroup comparison was insignificant in relation to PD and CAL. The adjunctive treatment with diode laser showed better efficacy in ensuring a better periodontal treatment than SRP alone. How to cite this article: Abdullah LA, Hashim N, Rehman MM, et al. Effectiveness of Diode (810 nm) Laser in Periodontal Parameters and Reduction of Subgingival Bacterial Load in Periodontitis Patients. J Contemp Dent Pract 2023;24(12):1008-1015.
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Affiliation(s)
- Luai A Abdullah
- Department of Periodontics, Sudanese Medical Specialization Board, Al Khurtum, Sudan
| | - Nada Hashim
- Department of Periodontology, RAK College of Dental Sciences, RAK Medical & Health Sciences University, Ras Al-Khaimah, United Arab Emirates, Phone: +971585267057, e-mail:
| | - Muhammed M Rehman
- Department of Periodontology, RAK College of Dental Sciences, RAK Medical & Health Sciences University, Ras Al-Khaimah, United Arab Emirates
| | - Mohammed H Elhaj
- Dpeartment of Periodontology, Faculty of Dentistry, University of Khartoum, Khartoum, Sudan
| | - Maowia M Mukhtar
- Department of Infectious Disease, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan
| | - Bakri G Gismalla
- Dpeartment of Periodontology, Faculty of Dentistry, University of Khartoum, Khartoum, Sudan
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Ohman E, Kilgore S, Waite-Cusic J, Kovacevic J. Before and After: Evaluation of Microbial and Organic Loads in Produce Handling and Packing Operations with Diverse Cleaning and Sanitizing Procedures. J Food Prot 2023; 86:100185. [PMID: 37884090 DOI: 10.1016/j.jfp.2023.100185] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 09/23/2023] [Accepted: 10/18/2023] [Indexed: 10/28/2023]
Abstract
Inadequate cleaning and/or sanitation (C/S) of food contact surfaces (FCSs) has been frequently reported during Produce Safety Rule inspections; however, limited data are available evaluating the effectiveness of C/S processes in produce operations. Different C/S practices were evaluated in four fresh produce operations for their efficacy in reducing microbial and organic loads on various FCSs. Microbial (aerobic plate counts; APC) and organic (ATP) loads were quantified during production, after cleaning, and after sanitizing, if applicable. Operations included: a berry packinghouse (BerryPK; wet cleaning), a blueberry harvest contractor (BerryHC; cleaning + sanitizing, C+S), and two mixed vegetable packinghouses (MixedV1; C+S, and MixedV2; rinsing + sanitizing, R+S). Following wet cleaning, significant reductions in APCs (p < 0.05) were seen on high-density polyethylene (HDPE) storage trays (n = 50) in BerryPK (3.1 ± 0.9 to 2.5 ± 0.7 log CFU/100 cm2). In BerryHC, a greater reduction in APCs was seen on HDPE harvest buckets (n = 25) following C+S (3.8 ± 0.5 to 1.1 ± 0.4 log CFU/100 cm2), compared to wet cleaning only in BerryPK. Stainless steel and conveyor belt FCSs (n = 16) in MixedV1 were sampled, and a significant reduction in APCs (p < 0.05) was observed when comparing in-use (4.8 ± 1.3 log CFU/100 cm2) to post-C+S (3.9 ± 0.7 log CFU/100 cm2). When similar FCSs (n = 17) were sampled in MixedV2, R+S also led to significant reduction in APCs (3.3 ± 0.6 to 1.9 ± 0.6 log CFU/100 cm2) (p < 0.05). ATP testing in fresh produce settings yielded inconsistent results, with no correlation between organic and bacterial loads detected during production (R2 = 0.00) across four operations, and weak correlations observed after cleaning (R2 = 0.18) and after sanitation (R2 = 0.33). The results from this study provide the foundational basis for future research on practical and effective C/S methods tailored to the produce industry.
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Affiliation(s)
- Erik Ohman
- Food Innovation Center, Oregon State University, 1207 NW Naito Parkway, Portland, OR 97209, USA
| | - Samantha Kilgore
- Wiegand Hall, Oregon State University, 3051 SW Campus Way, Corvallis, OR 97331, USA
| | - Joy Waite-Cusic
- Wiegand Hall, Oregon State University, 3051 SW Campus Way, Corvallis, OR 97331, USA
| | - Jovana Kovacevic
- Food Innovation Center, Oregon State University, 1207 NW Naito Parkway, Portland, OR 97209, USA.
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20
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Carruthers J, Finnie T. Using mixture density networks to emulate a stochastic within-host model of Francisella tularensis infection. PLoS Comput Biol 2023; 19:e1011266. [PMID: 38117811 PMCID: PMC10766174 DOI: 10.1371/journal.pcbi.1011266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 01/04/2024] [Accepted: 12/01/2023] [Indexed: 12/22/2023] Open
Abstract
For stochastic models with large numbers of states, analytical techniques are often impractical, and simulations time-consuming and computationally demanding. This limitation can hinder the practical implementation of such models. In this study, we demonstrate how neural networks can be used to develop emulators for two outputs of a stochastic within-host model of Francisella tularensis infection: the dose-dependent probability of illness and the incubation period. Once the emulators are constructed, we employ Markov Chain Monte Carlo sampling methods to parameterize the within-host model using records of human infection. This inference is only possible through the use of a mixture density network to emulate the incubation period, providing accurate approximations of the corresponding probability distribution. Notably, these estimates improve upon previous approaches that relied on bacterial counts from the lungs of macaques. Our findings reveal a 50% infectious dose of approximately 10 colony-forming units and we estimate that the incubation period can last for up to 11 days following low dose exposure.
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Affiliation(s)
- Jonathan Carruthers
- Data, Analytics and Surveillance; UK Health Security Agency, Porton Down, United Kingdom
| | - Thomas Finnie
- Data, Analytics and Surveillance; UK Health Security Agency, Porton Down, United Kingdom
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21
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Patel S, Awan KH, Freitas CMT, Bhandi S, Licari FW, Patil S. Diode laser targeting red-complex bacteria in periodontitis: a systematic review. Eur Rev Med Pharmacol Sci 2023; 27:11806-11816. [PMID: 38164844 DOI: 10.26355/eurrev_202312_34779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
OBJECTIVE This systematic review examines the effectiveness of diode laser irradiation in reducing the levels of red complex bacteria as well as periodontal parameters of pocket depth and clinical attachment level. MATERIALS AND METHODS We conducted electronic searches across databases such as Scopus, Embase, Medline, and Web of Science databases in July 2022. Randomized controlled trials that evaluated the reduction of red-complex bacteria in patients with periodontitis using diode lasers were included. The primary focus was the reduction in the microbial count of red complex bacteria, whereas probing depth and attachment level were considered secondary outcomes. Articles in languages other than English were excluded. Study quality was assessed based on the Cochrane Handbook for Systematic Reviews of Interventions and the ROB2 tool. RESULTS After searching the databases, eight independent studies were included, with a sample size of 210 subjects. The average age group of the study population was 30-60 years, and there was a lack of consensus on the antimicrobial effect of diode lasers. Out of the eight studies, four studies reported no significant difference in the levels of red complex bacteria before and after laser application. Three studies reported significantly lower levels of red complex bacteria in the intergroup comparison. One study reported that laser had no significant effect on intergroup bacterial levels. The combination of diode laser irradiation with scaling reduced the count of red complex bacteria and improved the clinical parameters, although not significantly. CONCLUSIONS Based on the limited evidence available, the adjunctive use of diode laser for scaling and root planning may provide some additional benefit in terms of reduction of red complex bacterial count and clinical parameters. Further well-designed trials and the use of objective measures are necessary before outlining universal guidelines for best practice. The adjunctive use of diode laser in non-surgical periodontal therapy may provide a reduction in the red complex microbial count and improvement in clinical parameters, decreasing the need for periodontal surgery.
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Affiliation(s)
- S Patel
- College of Graduate Studies, Roseman University of Health Sciences, South Jordan, Utah, USA.
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22
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Carr MA, Marquart ME, Sanchez M, Saleem W, Wellington OI, Lovell KM, McCallister A, Lightfoot V, Ost EB, Wise HZ, Huang B, Sharma AC. Innovative cold atmospheric plasma (iCAP) decreases corneal ulcer formation and bacterial loads and improves anterior chamber health in methicillin resistant Staphylococcus aureus keratitis. Exp Eye Res 2023; 237:109692. [PMID: 37884203 PMCID: PMC10841653 DOI: 10.1016/j.exer.2023.109692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/02/2023] [Accepted: 10/23/2023] [Indexed: 10/28/2023]
Abstract
Bacterial keratitis is a vision-threatening infection of the cornea that is typically treated with antibiotics. However, antibiotics sometimes fail to eradicate the infection and do not prevent or repair the damage caused directly by the bacteria or the host immune response to the infection. Our group previously demonstrated that treatment of Pseudomonas aeruginosa keratitis in rabbits with innovative cold atmospheric plasma (iCAP) resulted in reduced edema, ulcer formation, and bacterial load. In this study, we investigated the efficacy of iCAP treatment in methicillin-resistant Staphylococcus aureus (MRSA). New Zealand white rabbits were infected intrastromally with MRSA then treated with iCAP, moxifloxacin, vancomycin, or combination of iCAP with each antibiotic to assess the safety and efficacy of iCAP treatment compared to untreated controls and antibiotics. iCAP treatment significantly reduced bacterial loads and inflammation, improved anterior chamber clarity, and prevented corneal ulceration compared to untreated controls and antibiotic treatment. Safety assessments of grimace test scores and tear production showed that iCAP was not significantly different from either antibiotic treatment in terms of distress or tear production. Combination iCAP/antibiotic treatment did not appear to provide significant added benefit over iCAP alone. Our findings suggest that the addition of iCAP may be a viable tool in reducing damage to the cornea and anterior chamber of the eye following S. aureus keratitis.
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Affiliation(s)
- Mary A Carr
- Center for Immunology and Microbial Research and the Department of Cell and Molecular Biology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.
| | - Mary E Marquart
- Center for Immunology and Microbial Research and the Department of Cell and Molecular Biology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.
| | - Miguel Sanchez
- Experimental Therapeutics and Diagnostics Group, Lynntech Inc., 2501 Earl Rudder Fwy South, College Station, TX, 77845, USA.
| | - Waqar Saleem
- Experimental Therapeutics and Diagnostics Group, Lynntech Inc., 2501 Earl Rudder Fwy South, College Station, TX, 77845, USA.
| | - Ocean I Wellington
- Center for Immunology and Microbial Research and the Department of Cell and Molecular Biology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.
| | - K Michael Lovell
- Center for Immunology and Microbial Research and the Department of Cell and Molecular Biology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.
| | - Aaliyah McCallister
- Center for Immunology and Microbial Research and the Department of Cell and Molecular Biology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.
| | - Victoria Lightfoot
- Experimental Therapeutics and Diagnostics Group, Lynntech Inc., 2501 Earl Rudder Fwy South, College Station, TX, 77845, USA.
| | - Evan B Ost
- Experimental Therapeutics and Diagnostics Group, Lynntech Inc., 2501 Earl Rudder Fwy South, College Station, TX, 77845, USA.
| | - Hua Z Wise
- Experimental Therapeutics and Diagnostics Group, Lynntech Inc., 2501 Earl Rudder Fwy South, College Station, TX, 77845, USA.
| | - Bo Huang
- Department of Ophthalmology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.
| | - Anjal C Sharma
- Experimental Therapeutics and Diagnostics Group, Lynntech Inc., 2501 Earl Rudder Fwy South, College Station, TX, 77845, USA.
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Quintana RM, Scarparo RK, Münchow EA, Pinheiro LS, Tavares CO, Kopper PMP. Does aPDT reduce bacterial load in endodontic infected teeth? A systematic review and meta-analysis. Lasers Med Sci 2023; 38:268. [PMID: 37981598 DOI: 10.1007/s10103-023-03938-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 11/14/2023] [Indexed: 11/21/2023]
Abstract
This systematic review investigated whether antimicrobial photodynamic therapy (aPDT) after chemomechanical root canal disinfection (CD) yields a greater microbial load reduction than only CD. An electronic literature search was conducted on four databases up to November 2022, with no language or publication date restrictions. Randomized and non-randomized clinical trials were included if participants had a primary endodontic infection in permanent teeth, and if microbial loads before and after using aPDT were compared. Two researchers independently screened titles and abstracts to determine study eligibility. Assessments included risk of bias and methodological quality. This review was registered in PROSPERO (CRD42020181783). Eight studies were included in the qualitative analysis, and six were eligible for meta-analysis. In the random effects model, aPDT significantly improved the results of root canal disinfection when compared with standard protocols for cleaning and shaping (p = 0.04, 95% CI -1.72, -0.05). Subgroup analysis suggested that aPDT has a better effect on reducing the load of anaerobic microorganisms (p = 0.003, 95% CI -3.36, -0.69). The use of aPDT as an adjunct to chemomechanical disinfection promotes additional reduction of the microbial load and, therefore, seems to improve the results of root canal treatments in permanent teeth with a primary endodontic infection. However, certainty of evidence should be improved.
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Affiliation(s)
- Ramiro Martins Quintana
- Graduate Program in Dentistry, School of Dentistry, Federal University of Rio Grande Do Sul (UFRGS), Ramiro Barcellos, 2492. Santa Cecícila, Porto Alegre, RS, Brazil
| | - Roberta Kochenborger Scarparo
- Graduate Program in Dentistry, School of Dentistry, Federal University of Rio Grande Do Sul (UFRGS), Ramiro Barcellos, 2492. Santa Cecícila, Porto Alegre, RS, Brazil
| | - Eliseu Aldrighi Münchow
- Graduate Program in Dentistry, School of Dentistry, Federal University of Rio Grande Do Sul (UFRGS), Ramiro Barcellos, 2492. Santa Cecícila, Porto Alegre, RS, Brazil
| | - Lucas Siqueira Pinheiro
- Graduate Program in Dentistry, School of Dentistry, Federal University of Rio Grande Do Sul (UFRGS), Ramiro Barcellos, 2492. Santa Cecícila, Porto Alegre, RS, Brazil
| | - Cauana Oliva Tavares
- Graduate Program in Dentistry, School of Dentistry, Federal University of Rio Grande Do Sul (UFRGS), Ramiro Barcellos, 2492. Santa Cecícila, Porto Alegre, RS, Brazil
| | - Patricia Maria Poli Kopper
- Graduate Program in Dentistry, School of Dentistry, Federal University of Rio Grande Do Sul (UFRGS), Ramiro Barcellos, 2492. Santa Cecícila, Porto Alegre, RS, Brazil.
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Mondal P, Halder P, Mallick B, Bhaumik S, Koley H, Dutta S, Dutta M. Controlling the bacterial load of Salmonella Typhi in an experimental mouse model by a lytic Salmonella phage STWB21: a phage therapy approach. BMC Microbiol 2023; 23:324. [PMID: 37924001 PMCID: PMC10623789 DOI: 10.1186/s12866-023-03040-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 10/03/2023] [Indexed: 11/06/2023] Open
Abstract
BACKGROUND Salmonella enterica serotype Typhi is one of the major pathogens causing typhoid fever and a public health burden worldwide. Recently, the increasing number of multidrug-resistant strains of Salmonella spp. has made this utmost necessary to consider bacteriophages as a potential alternative to antibiotics for S. Typhi infection treatment. Salmonella phage STWB21, isolated from environmental water, has earlier been reported to be effective as a safe biocontrol agent by our group. In this study, we evaluated the efficacy of phage STWB21 in reducing the burden of salmonellosis in a mammalian host by inhibiting Salmonella Typhi invasion into the liver and spleen tissue. RESULTS Phage treatment significantly improved the survival percentage of infected mice. This study also demonstrated that oral administration of phage treatment could be beneficial in both preventive and therapeutic treatment of salmonellosis caused by S. Typhi. Altogether the result showed that the phage treatment could control tissue inflammation in mice before and after Salmonella infection. CONCLUSIONS To the best of our knowledge, this is the first report of phage therapy in a mouse model against a clinically isolated Salmonella Typhi strain that includes direct visualization of histopathology and ultrathin section microscopy images from the liver and spleen sections.
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Affiliation(s)
- Payel Mondal
- Division of Electron Microscopy, ICMR-National Institute of Cholera & Enteric Diseases, P-33, C.I.T. Road, Scheme XM, Beliaghata, 700010, Kolkata, West Bengal, India
| | - Prolay Halder
- Division of Bacteriology, ICMR-National Institute of Cholera & Enteric Diseases, P-33, C.I.T. Road, Scheme XM, Beliaghata, 700010, Kolkata, West Bengal, India
| | - Bani Mallick
- Division of Electron Microscopy, ICMR-National Institute of Cholera & Enteric Diseases, P-33, C.I.T. Road, Scheme XM, Beliaghata, 700010, Kolkata, West Bengal, India
| | - Subhadip Bhaumik
- University Science Instrumentation Centre, The University of Burdwan, Golapbag, Burdwan, 713104, West Bengal, India
| | - Hemanta Koley
- Division of Bacteriology, ICMR-National Institute of Cholera & Enteric Diseases, P-33, C.I.T. Road, Scheme XM, Beliaghata, 700010, Kolkata, West Bengal, India
| | - Shanta Dutta
- Division of Bacteriology, ICMR-National Institute of Cholera & Enteric Diseases, P-33, C.I.T. Road, Scheme XM, Beliaghata, 700010, Kolkata, West Bengal, India
| | - Moumita Dutta
- Division of Electron Microscopy, ICMR-National Institute of Cholera & Enteric Diseases, P-33, C.I.T. Road, Scheme XM, Beliaghata, 700010, Kolkata, West Bengal, India.
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Atalay YA, Mengistie E, Tolcha A, Birhan B, Asmare G, Gebeyehu NA, Gelaw KA. Indoor air bacterial load and antibiotic susceptibility pattern of isolates at Adare General Hospital in Hawassa, Ethiopia. Front Public Health 2023; 11:1194850. [PMID: 38026319 PMCID: PMC10653387 DOI: 10.3389/fpubh.2023.1194850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 09/28/2023] [Indexed: 12/01/2023] Open
Abstract
Background Air is the agent of pathogenic microbes that cause significant problems in the hospital environment. Multidrug resistance poses a major therapeutic challenge to these airborne microorganisms in hospital indoor environments. Method and materials This study was conducted at Adare General Hospital in Hawassa City, Sidama, Ethiopia. A cross-sectional study was conducted. The proportional allocation method was used to select the sampled 50 rooms from the total available rooms in each category of wards and staff offices. A total of 100 indoor air samples were collected using settle plates in all units twice a day, morning (9:00-4:00 a.m.) and afternoon (3:00-4:00 p.m.). The types and number of colonies were determined in the laboratory, and the pathogenic bacteria were isolated by appropriate bacteriological techniques. Antimicrobial susceptibility testing was performed on Mueller-Hinton agar for each potentially pathogenic bacterium isolated. For each bacterium, a total of 12 antibiotics were tested using the Kirby-Bauer disk diffusion method. The test organism was adjusted to McFarland turbidity standards of 0.5. Data were entered and analyzed using the SPSS version 25 window. Descriptive analysis and one-way analysis of variance were performed. Results The indoor air bacterial load of Adare General Hospital was found in the range between 210 and 3,224 CFU/m3. The highest indoor air bacterial load was identified from the gynecology ward with a mean of 2,542.5CFU/m3 at p < 0.05. From 100 indoor air samples, a total of 116 bacterial pathogen isolates were obtained. Gram-positive isolates predominated at 72.4%, of which 37.1% were Staphylococcus aureus, 26.7% were coagulase-negative Staphylococci, and the rest 8.6% were Streptococcus pyogenes. The isolation of pathogenic bacteria Staphylococcus aureus and coagulase-negative Staphylococci showed a high level of resistance to ampicillin. Conclusion A high bacterial load was found in the study area as compared to different indoor air biological standards. Staphylococcus aureus and coagulase-negative Staphylococci were the isolated predominant bacteria. Attention should be given to preventing and minimizing those environmental factors that favor the multiplication of bacteria in the indoor environment of a hospital for the safe health of patients, visitors, and staff.
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Affiliation(s)
- Yibeltal Assefa Atalay
- School of Public Health, College of Health Sciences, and Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
| | - Embialle Mengistie
- Department of Environmental Health, College of Health Sciences, and Medicine, Hawassa University, Hawassa, Ethiopia
| | - Alemu Tolcha
- Department of Environmental Health, College of Health Sciences, and Medicine, Hawassa University, Hawassa, Ethiopia
| | - Belete Birhan
- Department of Psychiatry, College of Health Sciences, and Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
| | - Getachew Asmare
- School of Public Health, College of Health Sciences, and Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
| | - Natnael Atnafu Gebeyehu
- School of Midwifery, College of Health Sciences, and Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
| | - Kelemu Abebe Gelaw
- School of Midwifery, College of Health Sciences, and Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
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Álvaro-Afonso FJ, Flores-Escobar S, Sevillano-Fernández D, García-Álvarez Y, García-Madrid M, Lázaro-Martínez JL. A deeper look at low-frequency contact ultrasonic debridement in the clinical management of patients with diabetic foot ulcers. Wound Repair Regen 2023; 31:745-751. [PMID: 37955618 DOI: 10.1111/wrr.13124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 07/20/2023] [Accepted: 10/23/2023] [Indexed: 11/14/2023]
Abstract
The current study aimed to evaluate the dispersal of solution and microbes (aerosol) in the clinical environment during treatment with Low-frequency contact ultrasonic debridement (LFCUD) with or without suction attachment in patients with diabetic foot ulcers (DFUs). We performed 20 treatments in 10 patients divided into two groups to receive the proposed LFCUD modalities. We measured the microbial load of the environment pre-treatment (sample M1), during treatment with each LFCUD modality (sample M2) and post-treatment (sample M3). The use of LFCUD debridement without a suction attachment results in significantly higher immediate contamination of the clinic environment than the suction attachment, particularly during the procedure (1.70 ± 0.98 log 10 CFU/mL versus 0.77 ± 0.85 log 10 CFU/mL, p = 0.035). When suction is not applied, there are statistically significant differences depending on whether the DFUs are neuropathic or neuroischemic, finding a greater number of microorganisms with high loads in neuropathic DFUs. We found a statistically significant positive correlation between wound area (r = 0.450, p = 0.047) and TBI (r = 0.651, p = 0.006) with the bacterial load during the LFCUD. Based on our results, we recommend using the personal protective equipment required to protect staff members and patients during treatment with LFCUD and using a suction attachment where clinically possible to reduce clinic environmental pollution, especially in neuropathic DFUs and those with larger areas.
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Affiliation(s)
- Francisco J Álvaro-Afonso
- Complutense University of Madrid, University Podiatric Clinic, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain
| | - Sebastián Flores-Escobar
- Complutense University of Madrid, University Podiatric Clinic, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain
| | | | - Yolanda García-Álvarez
- Complutense University of Madrid, University Podiatric Clinic, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain
| | - Marta García-Madrid
- Complutense University of Madrid, University Podiatric Clinic, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain
| | - José L Lázaro-Martínez
- Complutense University of Madrid, University Podiatric Clinic, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain
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Sujka J, McEwen C, Sandhu M, Sunderland M, Mhaskar R, Mooney A, DuCoin C. Staple Line Bacterial Load May Not Be a Contra-Indication to Magnetic Sphincter Augmentation Placement During Primary Sleeve Gastrectomy. Obes Surg 2023; 33:3703-3705. [PMID: 37792251 DOI: 10.1007/s11695-023-06869-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 09/20/2023] [Accepted: 09/25/2023] [Indexed: 10/05/2023]
Affiliation(s)
- Joseph Sujka
- Department of Surgery, University of South Florida, Tampa, FL, USA.
| | - Courtney McEwen
- University of South Florida College of Medicine, Tampa, FL, USA
| | - Mannat Sandhu
- University of South Florida College of Medicine, Tampa, FL, USA
| | | | - Rahul Mhaskar
- University of South Florida College of Medicine, Tampa, FL, USA
| | - Ashley Mooney
- Department of Surgery, University of South Florida, Tampa, FL, USA
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Dong J, Jiang Y, Li Z, Liu K, Guo L, Cui L, Wang H, Li J. Enterococcus faecium supplementation prevents enteritis caused by Escherichia coli in goats. Benef Microbes 2023; 14:477-491. [PMID: 38656096 DOI: 10.1163/18762891-20220133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 06/07/2023] [Indexed: 04/26/2024]
Abstract
The probiotic Enterococcus faecium is a gut microbe with immunomodulatory effects, which has been widely used to prevent diarrhoea in pigs and birds. Escherichia coli is a common pathogen that causes inflammatory bowel disease in animals. The aim of this study was to investigate the protective effects of E. faecium on enteritis in goats. Forty goats were randomly divided into 4 treatment groups: control, E. faecium, E. coli, and E. faecium + E. coli. The changes of physiological indicators and diarrhoea scoring were evaluated on days -4, -2, 0, 2, 4, 6, and 8. The pathological examination, inflammatory cytokines mRNA expression and bacterial counts in jejunum and caecum were detected on day 4 and 8. The results showed that body temperature, respiratory rate, heart rate and leukocyte counts all increased from the 2nd to the 6th day after feeding with E. coli, and the diarrhoea score was significantly increased. However, E. faecium-pretreated goats had lower body temperatures and fewer leukocytes than E. coli-treated goats on day 2, as well as decreased diarrhoea scores. E. coli treatment caused histopathological damage and morphological changes in the jejunum and caecum, while pretreatment with E. faecium significantly alleviated these injuries. E. faecium pretreatment can reduce the load of E. coli and increase the prevalence of Lactobacillus, thereby balancing the microbiota in the intestine. Furthermore, E. coli-infected goats pretreated with E. faecium showed obvious inhibition of Toll-like receptor 4, interleukin (IL)-1β, IL-6, IL-8 and tumour necrosis factor-α mRNA expression in the jejunum and caecum compared to that in the E. coli treatment group. In conclusion, the addition of E. faecium to goat feed is beneficial for improving clinical symptoms, maintaining intestinal mucosa integrity, balancing the microbiota and decreasing inflammatory responses in E. coli-induced intestinal injury.
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Affiliation(s)
- J Dong
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Important Animal Infectious Diseases and Zoonoses of Jiangsu Higher Education Institutions, 225009 Yangzhou, China P.R
| | - Y Jiang
- Guangling College of Yangzhou University, 225009 Yangzhou, China P.R
- Medical College of Yangzhou University, 225009 Yangzhou, China P.R
| | - Z Li
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Important Animal Infectious Diseases and Zoonoses of Jiangsu Higher Education Institutions, 225009 Yangzhou, China P.R
| | - K Liu
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Important Animal Infectious Diseases and Zoonoses of Jiangsu Higher Education Institutions, 225009 Yangzhou, China P.R
| | - L Guo
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Important Animal Infectious Diseases and Zoonoses of Jiangsu Higher Education Institutions, 225009 Yangzhou, China P.R
| | - L Cui
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Important Animal Infectious Diseases and Zoonoses of Jiangsu Higher Education Institutions, 225009 Yangzhou, China P.R
| | - H Wang
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Important Animal Infectious Diseases and Zoonoses of Jiangsu Higher Education Institutions, 225009 Yangzhou, China P.R
| | - J Li
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, 225009 Yangzhou, China P.R
- Joint International Research Laboratory of Important Animal Infectious Diseases and Zoonoses of Jiangsu Higher Education Institutions, 225009 Yangzhou, China P.R
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Sutarlie L, Chee HL, Ow SY, Aabdin Z, Tjiu WW, Su X. A rapid total bacterial count method using gold nanoparticles conjugated with an aptamer for water quality assessment. Nanoscale 2023; 15:16675-16686. [PMID: 37823252 DOI: 10.1039/d3nr02635c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
Total bacterial count is a routine parameter in microbial safety assessment used in many fields, such as drinking water and industrial water testing. The current gold standard method for counting bacteria is the plate culture method (or heterotrophic plate count) that requires a microbiology laboratory and a long turnover time of at least 24 hours. To tackle these shortcomings, we developed a rapid total bacterial count method that relies on gold nanoparticles (AuNPs) conjugated with affinity ligands to stain bacterial cells captured on a syringe filter. Two affinity ligands were exploited, i.e. a DNA aptamer (AB2) and a lectin Griffonia simplicifolia II (GSII) that recognize bacterial cell wall commonalities, i.e. peptidoglycan and its amino sugars. Upon proper formulation with addition of a surfactant, the AB2 conjugated AuNPs (AB2-AuNPs) can selectively stain bacterial cells captured on the filter membrane with a higher sensitivity than GSII-AuNPs. Measuring the staining intensity using an in-house-built handheld detector allowed us to correlate its intensity reading with the total number of bacterial units present. This bacteria quantification method, referred to as "Filter-and-Stain", had an efficient turnover time of 20 min suggesting its potential usage for rapid on-site applications. Additionally, the detection sensitivity provided by the AB2-AuNP nanoreagent offered a limit of detection as low as 100 CFU mL-1. We have demonstrated the use of the AB2-AuNPs for detection of bacteria from environmental water samples.
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Affiliation(s)
- Laura Sutarlie
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
| | - Heng Li Chee
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
| | - Sian Yang Ow
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
| | - Zainul Aabdin
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
| | - Weng Weei Tjiu
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
| | - Xiaodi Su
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
- Department of Chemistry, National University of Singapore, Block S8, Level 3, 3 Science Drive 3, Singapore 117543
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Alqutaibi AY, Aljohani A, Alduri A, Masoudi A, Alsaedi AM, Al-Sharani HM, Farghal AE, Alnazzawi AA, Aboalrejal AN, Mohamed AAH, Zafar MS. The Effectiveness of Cold Atmospheric Plasma (CAP) on Bacterial Reduction in Dental Implants: A Systematic Review. Biomolecules 2023; 13:1528. [PMID: 37892210 PMCID: PMC10604822 DOI: 10.3390/biom13101528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 09/27/2023] [Accepted: 10/06/2023] [Indexed: 10/29/2023] Open
Abstract
BACKGROUND The emergence of dental implants has revolutionized the management of tooth loss. However, the placement of clinical implants exposes them to complex oral environment and numerous microscopic entities, such as bacteria. Cold atmospheric plasma (CAP) is often used to treat the surfaces of dental implants, which alters morphological features and effectively reduces bacterial load. PURPOSE This systematic review aims to assess the existing literature on the bactericidal properties of CAP when used on various kinds of dental implant surfaces. REVIEW METHOD An in-depth examination of MEDLINE/PubMed and EMBASE was performed to identify relevant studies, with the most recent search conducted in May 2023. Studies were selected based on their exploration of CAP's effects on dental implants compared to control groups, focusing on CAP's bactericidal efficacy. However, studies that lacked a control group or that failed to measure bactericidal effects were excluded. RESULTS After applying the selection criteria, 15 studies were ultimately included in the systematic review. The collected data suggest that CAP can effectively reduce bacterial loads on dental implant surfaces, including pathogens like Streptococcus mitis and Staphylococcus aureus. Furthermore, CAP appears to combat biofilms and plaques that are key contributors to periimplantitis. CONCLUSION CAP emerges as a promising treatment option, exhibiting significant bactericidal activity on dental implant surfaces. CAP can decrease the rates of bacterial biofilm and plaque formation, leading to improved outcomes for dental implant patients.
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Affiliation(s)
- Ahmed Yaseen Alqutaibi
- Department of Substitutive Dental Science, College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia; (A.E.F.); (A.A.A.)
- Prosthodontics Department, College of Dentistry, Ibb University, Ibb 70270, Yemen
| | - Abdulbari Aljohani
- College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia; (A.A.); (A.A.); (A.M.); (A.M.A.)
| | - Abdullah Alduri
- College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia; (A.A.); (A.A.); (A.M.); (A.M.A.)
| | - Abdulmajid Masoudi
- College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia; (A.A.); (A.A.); (A.M.); (A.M.A.)
| | - Anas M. Alsaedi
- College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia; (A.A.); (A.A.); (A.M.); (A.M.A.)
| | - Hesham Mohammed Al-Sharani
- National Center for Epidemiology and Population Health, ANU College of Health and Medicine, Canberra 2601, Australia;
| | - Ahmed E. Farghal
- Department of Substitutive Dental Science, College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia; (A.E.F.); (A.A.A.)
| | - Ahmad Abdulkareem Alnazzawi
- Department of Substitutive Dental Science, College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia; (A.E.F.); (A.A.A.)
| | | | - Abdel-Aleam H. Mohamed
- Physics Department, College of Science, Taibah University, Al Madinah 42353, Saudi Arabia;
- Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62521, Egypt
| | - Muhammad Sohail Zafar
- Department of Restorative Dentistry, College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia
- School of Dentistry, University of Jordan, Amman 11942, Jordan
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Xue-Meng C, Gao-Wang L, Xiao-Mei L, Fan-Fang Z, Jin-Fang X. Effect of mechanical ventilation under intubation on respiratory tract change of bacterial count and alteration of bacterial flora. Exp Lung Res 2023; 49:165-177. [PMID: 37789686 DOI: 10.1080/01902148.2023.2264947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 09/24/2023] [Indexed: 10/05/2023]
Abstract
Background: The most common 'second strike' in mechanically ventilated patients is a pulmonary infection caused by the ease with which bacteria can invade and colonize the lungs due to mechanical ventilation. At the same time, metastasis of lower airway microbiota may have significant implications in developing intubation mechanical ventilation lung inflammation. Thus, we establish a rat model of tracheal intubation with mechanical ventilation and explore the effects of mechanical ventilation on lung injury and microbiological changes in rats. To provide a reference for preventing and treating bacterial flora imbalance and pulmonary infection injury caused by mechanical ventilation of tracheal intubation. Methods: Sprague-Dawley rats were randomly divided into Control, Mechanical ventilation under intubation (1, 3, 6 h) groups, and Spontaneously breathing under intubation (1, 3, 6 h). Lung histopathological injury scores were evaluated. 16SrDNA sequencing was performed to explore respiratory microbiota changes, especially, changes of bacterial count and alteration of bacterial flora. Results: Compared to groups C and SV, critical pathological changes in pulmonary lesions occurred in the MV group after 6 h (p < 0.05). The Alpha diversity and Beta diversity of lower respiratory tract microbiota in MV6, SV6, and C groups were statistically significant (p < 0.05). The main dominant bacterial phyla in the respiratory tract of rats were Proteobacteria, Firmicutes, Bacteroidetes, and Cyanobacteria. Acinetobacter radioresistens in group C was significant, Megaonas in group MV6 was significantly increased, and Parvibacter in group SV6 was significantly increased. Anaerobic, biofilm formation, and Gram-negative bacteria-related functional genes were altered during mechanical ventilation with endotracheal intubation. Conclusion: Mechanical ventilation under intubation may cause dysregulation of lower respiratory microbiota in rats.
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Affiliation(s)
- Chen Xue-Meng
- Department of Anesthesiology, Deyang People's Hospital, Deyang, Sichuan, China
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Liu Gao-Wang
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Ling Xiao-Mei
- Department of Anesthesiology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China
| | - Zeng Fan-Fang
- Department of Anesthesiology, Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Xiao Jin-Fang
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
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Lucassen R, van Leuven N, Bockmühl D. A loophole in soap dispensers mediates contamination with Gram-negative bacteria. Microbiologyopen 2023; 12:e1384. [PMID: 37877653 PMCID: PMC10541457 DOI: 10.1002/mbo3.1384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 09/11/2023] [Accepted: 09/19/2023] [Indexed: 10/26/2023] Open
Abstract
Liquid soap dispensers are widely used in domestic and clinical settings. In previous studies, the risk of bacterial contamination of refillable systems was pointed out and a bacterial contamination rate of 25%, with values of up to 108 colony-forming units/mL (CFU/mL), was reported. However, the route of contamination remains elusive. To address this point, we determined the microbial contamination of refillable standard pump dispensers and nonrefillable press-dispenser systems. Following the collection of 104 liquid soap dispensers from hotel rooms across Germany, bacterial counts were determined. Isolates of samples containing nonfastidious Gram-negative(lac-) bacteria were further analyzed by the Vitek 2 system for the determination of species. 70.2% of the refillable pump dispensers (mean total bacterial count = 2.2 × 105 CFU/mL) but only 10.6% of the nonrefillable press dispensers, were contaminated (mean total bacterial count = 1.5 × 101 CFU/mL). Of samples containing nonfastidious Gram-negative(lac-) bacteria, Pluralibacter gergoviae was present in 41.7%, Pseudomonads (Pseudomonas aeruginosa and Pseudomonas putida) in 25%, Serratia marcescens in 16.7%, and Klebsiella oxytoca and Pasteurella testudinis in 8.3%. After the initial assessment, we contaminated different dispensing systems with P. aeruginosa/P. gergoviae, to reveal the route of contamination and identied the pressure release of standard pump dispensers as the loophole for microbial contamination.
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Affiliation(s)
- Ralf Lucassen
- Faculty of Life SciencesRhine Waal University of Applied SciencesKleveGermany
| | - Nicole van Leuven
- Faculty of Life SciencesRhine Waal University of Applied SciencesKleveGermany
| | - Dirk Bockmühl
- Faculty of Life SciencesRhine Waal University of Applied SciencesKleveGermany
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Eke IE, Williams JT, Haiderer ER, Albrecht VJ, Murdoch HM, Abdalla BJ, Abramovitch RB. Discovery and characterization of antimycobacterial nitro-containing compounds with distinct mechanisms of action and in vivo efficacy. Antimicrob Agents Chemother 2023; 67:e0047423. [PMID: 37610224 PMCID: PMC10508139 DOI: 10.1128/aac.00474-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 06/30/2023] [Indexed: 08/24/2023] Open
Abstract
Nitro-containing compounds have emerged as important agents in the control of tuberculosis (TB). From a whole-cell high-throughput screen for Mycobacterium tuberculosis (Mtb) growth inhibitors, 10 nitro-containing compounds were prioritized for characterization and mechanism of action studies. HC2209, HC2210, and HC2211 are nitrofuran-based prodrugs that need the cofactor F420 machinery for activation. Unlike pretomanid which depends only on deazaflavin-dependent nitroreductase (Ddn), these nitrofurans depend on Ddn and possibly another F420-dependent reductase for activation. These nitrofurans also differ from pretomanid in their potent activity against Mycobacterium abscessus. Four dinitrobenzamides (HC2217, HC2226, HC2238, and HC2239) and a nitrofuran (HC2250) are proposed to be inhibitors of decaprenyl-phosphoryl-ribose 2'-epimerase 1 (DprE1), based on isolation of resistant mutations in dprE1. Unlike other DprE1 inhibitors, HC2250 was found to be potent against non-replicating persistent bacteria, suggesting additional targets. Two of the compounds, HC2233 and HC2234, were found to have potent, sterilizing activity against replicating and non-replicating Mtb in vitro, but a proposed mechanism of action could not be defined. In a pilot in vivo efficacy study, HC2210 was orally bioavailable and efficacious in reducing bacterial load by ~1 log in a chronic murine TB infection model.
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Affiliation(s)
- Ifeanyichukwu E. Eke
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - John T. Williams
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Elizabeth R. Haiderer
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Veronica J. Albrecht
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Heather M. Murdoch
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Bassel J. Abdalla
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Robert B. Abramovitch
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
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Wang C, Xia Y, Wang R, Li J, Chan CL, Kao RYT, Toy PH, Ho PL, Li H, Sun H. Metallo-sideromycin as a dual functional complex for combating antimicrobial resistance. Nat Commun 2023; 14:5311. [PMID: 37658047 PMCID: PMC10474269 DOI: 10.1038/s41467-023-40828-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 08/11/2023] [Indexed: 09/03/2023] Open
Abstract
The rapid emergence of antimicrobial resistance (AMR) pathogens highlights the urgent need to approach this global burden with alternative strategies. Cefiderocol (Fetroja®) is a clinically-used sideromycin, that is utilized for the treatment of severe drug-resistant infections, caused by Gram-negative bacteria; there is evidence of cefiderocol-resistance occurring in bacterial strains however. To increase the efficacy and extend the life-span of sideromycins, we demonstrate strong synergisms between cefiderocol and metallodrugs (e.g., colloidal bismuth citrate (CBS)), against Pseudomonas aeruginosa and Burkholderia cepacia. Moreover, CBS enhances cefiderocol efficacy against biofilm formation, suppresses the resistance development in P. aeruginosa and resensitizes clinically isolated resistant P. aeruginosa to cefiderocol. Notably, the co-therapy of CBS and cefiderocol significantly increases the survival rate of mice and decreases bacterial loads in the lung in a murine acute pneumonia model. The observed phenomena are partially attributable to the competitive binding of Bi3+ to cefiderocol with Fe3+, leading to enhanced uptake of Bi3+ and reduced levels of Fe3+ in cells. Our studies provide insight into the antimicrobial potential of metallo-sideromycins.
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Affiliation(s)
- Chenyuan Wang
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China
| | - Yushan Xia
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China
| | - Runming Wang
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China
| | - Jingru Li
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China
- Chemistry and Chemical Engineering Guangdong Laboratory, Guangdong, PR China
| | - Chun-Lung Chan
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China
| | - Richard Yi-Tsun Kao
- Department of Microbiology, The University of Hong Kong, Sassoon Road, Hong Kong SAR, PR China
| | - Patrick H Toy
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China
| | - Pak-Leung Ho
- Department of Microbiology, The University of Hong Kong, Sassoon Road, Hong Kong SAR, PR China
- Carol Yu Centre for Infection, The University of Hong Kong, Sassoon Road, Hong Kong SAR, PR China
| | - Hongyan Li
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China.
- State Key Laboratory of Synthetic Chemistry and CAS-HKU Joint Laboratory of Metallomics for Health and Environment, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China.
| | - Hongzhe Sun
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China.
- State Key Laboratory of Synthetic Chemistry and CAS-HKU Joint Laboratory of Metallomics for Health and Environment, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China.
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Liu J, Ge Y, Wang Q, Qian L, Pan Y, Zheng S, Shi Y. Waterjet in Bacterial Clearance of Diabetic Lower Extremity Contaminated Wounds: A Retrospective Cohort Study. INT J LOW EXTR WOUND 2023; 22:496-502. [PMID: 34106021 DOI: 10.1177/15347346211024204] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The waterjet debridement is now a standard practice in contaminated or infected diabetic lower extremity wounds. The bacterial clearance of the waterjet debridement remains an important parameter that should be predicted in this application. This study aimed to investigate the waterjet in reducing the diabetic lower extremity wound contaminants. A retrospective cohort study was conducted. Patients' etiology and pathogen diagnosis were established as diabetic lower extremity contaminated wound. The high-power waterjet (Versajet™, Smith-Nephew) was used in the treatment group and conventional surgical methods were used in the control group. The bacteriological swab samples were collected before and after the debridement. The results of bacterial culture were analyzed. A total of 74 patients were included in our study, 40 patients in the treatment group and 34 in the control group. Patient characteristics were well matched. The preoperative bacteriological swab samples of the 2 groups showed no significant difference between each other with a P value of .1022. The culture result of postoperative bacteriological swab samples in the treatment group was significantly lower than control with a P value of .0099. The odds of bacterial clearance were greater in the treatment group than in the control group (odds ratio, 5.139; 95% confidence interval, 1.386-18.41). As demonstrated by this retrospective research, waterjet debridement reduced the bacterial load in the diabetic lower extremity contaminated wounds.
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Affiliation(s)
- Jiaqi Liu
- Artificial Intelligence Center for Plastic Surgery and Cutaneous Soft Tissue Cancers, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Yining Ge
- Zhongshan Hospital, Fudan University, Shanghai, China
| | - Qiang Wang
- Zhongshan Hospital, Fudan University, Shanghai, China
| | - Leqi Qian
- Zhongshan Hospital, Fudan University, Shanghai, China
| | - Yuyan Pan
- Zhongshan Hospital, Fudan University, Shanghai, China
| | - Shaoluan Zheng
- Xiamen Branch, Zhongshan hospital, Fudan University, Xiamen, China
| | - Yuedong Shi
- Zhongshan Hospital, Fudan University, Shanghai, China
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Jervøe-Storm PM, Jepsen S, Marder M, Kraus D, Stoilov M, Enkling N. Prevention of internal bacterial colonization of dental implants: A comparative longitudinal observational study. Clin Oral Implants Res 2023; 34:979-986. [PMID: 37394702 DOI: 10.1111/clr.14124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 05/17/2023] [Accepted: 06/21/2023] [Indexed: 07/04/2023]
Abstract
OBJECTIVES Previous studies have indicated a progressive internal bacterial colonization of implants and possible implications for peri-implant bone loss. The aim of this study was to evaluate a decontamination protocol, two disinfectants, and a sealant for their ability to prevent such a colonization. MATERIALS AND METHODS Bacterial samples were harvested from the peri-implant sulcus (external) and following abutment removal from the implant cavity (internal) during routine supportive peri-implant care in 30 edentulous patients 2 years after they had obtained two implants. In a split-mouth design, implants were randomly assigned to receive either internal decontamination alone (10% H2 O2 , brush) or additional placement of either sealant (GS), disinfectant agent (CHX-varnish) or disinfectant gel (1% CHX-gel), in the internal cavity before remounting of abutment/suprastructure. Twelve months later, internal and external sampling was repeated. Total bacterial counts (TBCs) were determined using real-time PCR in a total of 240 samples (eight per patient). RESULTS Total bacterial counts in the internal cavity significantly reduced overall treatment modalities 1 year after the treatments (4.0 [2.3-6.9]-fold reduction; p = .000). No significant differences between the four treatment types were found (p = .348). Comparison of internal and external sampling points revealed significant correlation (R2 = .366; p = .000) with systematically higher TBC counts in external samples. CONCLUSIONS Within the limitations of the present study, it can be concluded that the use of disinfectant agents or a sealant did not show an additional benefit in the prevention of internal bacterial colonization of implants compared to a decontamination protocol alone.
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Affiliation(s)
- Pia-Merete Jervøe-Storm
- Department of Periodontology, Operative and Preventive Dentistry, University Hospital Bonn, Bonn, Germany
| | - Søren Jepsen
- Department of Periodontology, Operative and Preventive Dentistry, University Hospital Bonn, Bonn, Germany
| | - Michael Marder
- Department of Prosthodontics, Preclinical Education and Dental Material Science, University Hospital Bonn, Bonn, Germany
| | - Dominik Kraus
- Department of Prosthodontics, Preclinical Education and Dental Material Science, University Hospital Bonn, Bonn, Germany
| | - Milan Stoilov
- Department of Prosthodontics, Preclinical Education and Dental Material Science, University Hospital Bonn, Bonn, Germany
| | - Norbert Enkling
- Department of Prosthodontics, Preclinical Education and Dental Material Science, University Hospital Bonn, Bonn, Germany
- Department of Reconstructive Dentistry & Gerodontology, University of Bern, Bern, Switzerland
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Yan N, Xia H, Hou W, Wang H, Wang H, Zhou M. Biological Characterization of Pseudomonas fluorescens Phage Pf17397_F_PD1 and Its Application in Food Preservation. J Food Prot 2023; 86:100125. [PMID: 37406883 DOI: 10.1016/j.jfp.2023.100125] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 06/27/2023] [Accepted: 06/30/2023] [Indexed: 07/07/2023]
Abstract
In order to explore the application prospects of phages for controlling bacterial contamination, a lytic phage Pf17397_F_PD1 (Later abbreviated as PD1) was isolated from fish guts using Pseudomonas fluorescens ATCC 17397 as the host bacterium. The phage displayed short latency (18 min), long lysis period (212 min), and high lysis volume (1.47 × 102 PFU/each cell). It displayed wide temperature (30-70°C) and pH (4-11) tolerance. Genomic comparison revealed a maximum sequence identity of 48.65% between phage PD1 and other identified phages, indicating that PD1 was a new phage. The phage PD1 significantly inhibited the growth of P. fluorescens in milk and grass carp at 4°C and 25°C. Compared to the negative control, bacterial levels in milk stored at 25°C for 48 h were reduced by 2.71 log CFU/mL and 2.84 log CFU/mL at the multiplicity of infection (MOI) of 100 and 1,000, respectively. In contrast, when grass carp were stored at 25°C for 24 h, the bacterial load was reduced by 1.28 log CFU/g and 2.64 log CFU/g compared to the control (MOI of 100 and 1,000). When the phage was applied for preservation of grass carp blocks, total volatile salt nitrogen (TVB-N) values of phage-treated samples increased by 6.8 mg/100 g and 7.5 mg/100 g at MOI of 100 and 1,000, respectively, after 7 days of storage, which was significantly lower than that of the control group (15.83 mg/100 g). This study showed that phage PD1 was a good natural biological antimicrobial agent against P. fluorescens ATCC 17397.
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Affiliation(s)
- Na Yan
- School of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430000, China
| | - Hai Xia
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan 430000, China
| | - Wenfu Hou
- School of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430000, China
| | - Huajuan Wang
- School of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430000, China
| | - Hongxun Wang
- School of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430000, China.
| | - Min Zhou
- School of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430000, China.
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Albertini P, Mainardi P, Bagattini M, Lombardi A, Riccio P, Ragosta M, Pennino F, Bruzzese D, Triassi M. Risk Influence of Some Environmental and Behavioral Factors on Air Contamination in the Operating Room: An Experimental Study. Int J Environ Res Public Health 2023; 20:6592. [PMID: 37623177 PMCID: PMC10454192 DOI: 10.3390/ijerph20166592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 07/31/2023] [Accepted: 08/14/2023] [Indexed: 08/26/2023]
Abstract
Air contamination in operating rooms (ORs) depends on the conditions of the room and on activities therein performed. Methodologies of air quality assessment in ORs are often inadequately described in the scientific literature, and the time required for a change in status in air quality is never taken into account. The purpose of this study was to determine the influence of the state and the presence of human operators on air quality by implementing a precise measurement protocol that also took into account the time required for changes in the room to affect air pollution. As the main indicators of air pollution, bacterial load and concentration of airborne dust were measured. The results showed that: the use of surgical masks by operators in the OR did not significantly affect bacterial load within a distance of 2 m; keeping OR doors open did not induce a significant increase in bacterial load and of 5 μm particles while 10 μm particles concentration was positively affected; and air pollution measured with open doors was not significantly different from that due to the presence of two staff members, whether or not they were wearing masks. The results clarified the role of some factors on air pollution in ORs.
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Affiliation(s)
- Prospero Albertini
- Department of Public Health, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy; (P.A.); (P.M.); (M.B.); (A.L.); (D.B.); (M.T.)
| | - Pierangela Mainardi
- Department of Public Health, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy; (P.A.); (P.M.); (M.B.); (A.L.); (D.B.); (M.T.)
| | - Maria Bagattini
- Department of Public Health, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy; (P.A.); (P.M.); (M.B.); (A.L.); (D.B.); (M.T.)
| | - Annalisa Lombardi
- Department of Public Health, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy; (P.A.); (P.M.); (M.B.); (A.L.); (D.B.); (M.T.)
| | - Patrizia Riccio
- Department of Molecular Medicine and Medical Biotechnology, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy;
| | - Maria Ragosta
- School of Engineering, University of Basilicata, V.le dell’Ateneo Lucano N° 10, 85100 Potenza, Italy;
| | - Francesca Pennino
- Department of Public Health, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy; (P.A.); (P.M.); (M.B.); (A.L.); (D.B.); (M.T.)
| | - Dario Bruzzese
- Department of Public Health, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy; (P.A.); (P.M.); (M.B.); (A.L.); (D.B.); (M.T.)
| | - Maria Triassi
- Department of Public Health, University “Federico II”, Via Sergio Pansini N° 5, 80131 Naples, Italy; (P.A.); (P.M.); (M.B.); (A.L.); (D.B.); (M.T.)
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Deblais L, Ojeda A, Brhane M, Mummed B, Hassen KA, Ahmedo BU, Weldesenbet YD, Amin JK, Ahmed IA, Usmane IA, Yusuf EA, Seran AJ, Abrahim FI, Game HT, Mummed BA, Usmail MM, Umer KA, Dawid MM, Gebreyes W, French N, Hassen JY, Roba KT, Mohammed A, Yimer G, Saleem C, Chen D, Singh N, Manary MJ, McKune SL, Havelaar AH, Rajashekara G. Prevalence and Load of the Campylobacter Genus in Infants and Associated Household Contacts in Rural Eastern Ethiopia: a Longitudinal Study from the Campylobacter Genomics and Environmental Enteric Dysfunction (CAGED) Project. Appl Environ Microbiol 2023; 89:e0042423. [PMID: 37310259 PMCID: PMC10370295 DOI: 10.1128/aem.00424-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 05/22/2023] [Indexed: 06/14/2023] Open
Abstract
In our previous cross-sectional study, multiple species of Campylobacter were detected (88%) in stool samples from children (12 to 14 months of age) in rural eastern Ethiopia. This study assessed the temporal fecal carriage of Campylobacter in infants and identified putative reservoirs associated with these infections in infants from the same region. The prevalence and load of Campylobacter were determined using genus-specific real-time PCR. Stool samples from 106 infants (n = 1,073) were collected monthly from birth until 376 days of age (DOA). Human stool samples (mothers and siblings), livestock feces (cattle, chickens, goats, and sheep), and environmental samples (soil and drinking water) from the 106 households were collected twice per household (n = 1,644). Campylobacter was most prevalent in livestock feces (goats, 99%; sheep, 98%; cattle, 99%; chickens, 93%), followed by human stool samples (siblings, 91%; mothers, 83%; infants, 64%) and environmental samples (soil, 58%; drinking water, 43%). The prevalence of Campylobacter in infant stool samples significantly increased with age, from 30% at 27 DOA to 89% at 360 DOA (1% increase/day in the odds of being colonized) (P < 0.001). The Campylobacter load increased linearly (P < 0.001) with age from 2.95 logs at 25 DOA to 4.13 logs at 360 DOA. Within a household, the Campylobacter load in infant stool samples was positively correlated with the load in mother stool samples (r2 = 0.18) and soil collected inside the house (r2 = 0.36), which were in turn both correlated with Campylobacter loads in chicken and cattle feces (0.60 < r2 < 0.63) (P < 0.01). In conclusion, a high proportion of infants are infected with Campylobacter in eastern Ethiopia, and contact with the mother and contaminated soil may be associated with early infections. IMPORTANCE A high Campylobacter prevalence during early childhood has been associated with environmental enteric dysfunction (EED) and stunting, especially in low-resource settings. Our previous study demonstrated that Campylobacter was frequently found (88%) in children from eastern Ethiopia; however, little is known about potential Campylobacter reservoirs and transmission pathways leading to infection of infants by Campylobacter during early growth. In the longitudinal study presented here, Campylobacter was frequently detected in infants within the 106 surveyed households from eastern Ethiopia, and the prevalence was age dependent. Furthermore, preliminary analyses highlighted the potential role of the mother, soil, and livestock in the transmission of Campylobacter to the infant. Further work will explore the species and genetic composition of Campylobacter in infants and putative reservoirs using PCR and whole-genome and metagenomic sequencing. The findings from these studies can lead to the development of interventions to minimize the risk of transmission of Campylobacter to infants and, potentially, EED and stunting.
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Affiliation(s)
| | - Amanda Ojeda
- University of Florida, Gainesville, Florida, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Nigel French
- Massey University, Palmerston North, New Zealand
| | | | | | | | - Getnet Yimer
- Global One Health Initiative, The Ohio State University, Addis Ababa, Ethiopia
| | - Cyrus Saleem
- University of Florida, Gainesville, Florida, USA
| | - Dehao Chen
- University of Florida, Gainesville, Florida, USA
| | - Nitya Singh
- University of Florida, Gainesville, Florida, USA
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Keshavarz M, Zanchi C, Rolff J. The effect of combined knockdowns of Attacins on survival and bacterial load in Tenebrio molitor. Front Immunol 2023; 14:1140627. [PMID: 37063911 PMCID: PMC10090678 DOI: 10.3389/fimmu.2023.1140627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 03/14/2023] [Indexed: 03/31/2023] Open
Abstract
IntroductionUpon infection, insect hosts simultaneously express a cocktail of antimicrobial peptides (AMPs) which can impede pathogen colonization and increase host fitness. It has been proposed that such a cocktail might be adaptive if the effects of co-expressed AMPs are greater than the sum of individual activities. This could potentially prevent the evolution of bacterial resistance. However, in vivo studies on AMPs in combination are scarce. Attacins are one of the relatively large AMP families, which show anti-Gram-negative activity in vitro.Material and methodsHere, we used RNA interference (RNAi) to silence three members of the Attacin family genes in the mealworm beetle, Tenebrio molitor: (TmAttacin1a (TmAtt1a), TmAttacin1b (TmAtt1b), and TmAttacin2 (TmAtt2) both individually and in combination. We then infected T. molitor with the Gram negative entomopathogen Pseudomonas entomophila.ResultsWe found that survival of the beetles was only affected by the knockdown of TmAttacin1b, TmAttacin2 and the knockdown of all three Attacins together. Triple knockdown, rather than individual or double knockdowns of AMPs, changes the temporal dynamics of their efficiency in controlling the colonization of P. entomophila in the insect body.DiscussionMore precisely, AMP gene expression influences P. entomophila load early in the infection process, resulting in differences in host survival. Our results highlight the importance of studying AMP-interactions in vivo.
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Cameron SJS, Edwards A, Lambert RJ, Stroud M, Mur LAJ. Participants in the Trans-Antarctic Winter Traverse Expedition Showed Increased Bacterial Load and Diversity in Saliva but Maintained Individual Differences within Stool Microbiota and Across Metabolite Fingerprints. Int J Mol Sci 2023; 24:ijms24054850. [PMID: 36902282 PMCID: PMC10002533 DOI: 10.3390/ijms24054850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 02/28/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
Understanding the impact of long-term physiological and environmental stress on the human microbiota and metabolome may be important for the success of space flight. This work is logistically difficult and has a limited number of available participants. Terrestrial analogies present important opportunities to understand changes in the microbiota and metabolome and how this may impact participant health and fitness. Here, we present work from one such analogy: the Transarctic Winter Traverse expedition, which we believe is the first assessment of the microbiota and metabolome from different bodily locations during prolonged environmental and physiological stress. Bacterial load and diversity were significantly higher during the expedition when compared with baseline levels (p < 0.001) in saliva but not stool, and only a single operational taxonomic unit assigned to the Ruminococcaceae family shows significantly altered levels in stool (p < 0.001). Metabolite fingerprints show the maintenance of individual differences across saliva, stool, and plasma samples when analysed using flow infusion electrospray mass spectrometry and Fourier transform infrared spectroscopy. Significant activity-associated changes in terms of both bacterial diversity and load are seen in saliva but not in stool, and participant differences in metabolite fingerprints persist across all three sample types.
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Affiliation(s)
- Simon J. S. Cameron
- Institute for Global Food Security, School of Biological Sciences, Queen’s University Belfast, Chlorine Gardens, Belfast BT9 5DL, UK
- Correspondence: (S.J.S.C.); (L.A.J.M.)
| | - Arwyn Edwards
- Institute of Biological, Environmental and Rural Sciences, Edward Llywd Building, Penglais Campus, Aberystwyth SY23 3FG, UK
| | - Robert J. Lambert
- Department of Orthopaedics, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh EH16 4SA, UK
| | - Mike Stroud
- NIHR BRC Nutrition, University of Southampton Medical School, Southampton SO16 6YD, UK
| | - Luis A. J. Mur
- Institute of Biological, Environmental and Rural Sciences, Edward Llywd Building, Penglais Campus, Aberystwyth SY23 3FG, UK
- Correspondence: (S.J.S.C.); (L.A.J.M.)
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Arora S, Tagde P, Alam S, Akram W, Naved T, Gupta S. Influence of toll-like receptor-4 antagonist on bacterial load of asthma in Swiss albino mice: targeting TLR4/MD2 complex pathway. Environ Sci Pollut Res Int 2023; 30:32854-32865. [PMID: 36472742 DOI: 10.1007/s11356-022-24521-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 11/27/2022] [Indexed: 06/17/2023]
Abstract
Air pollution and environmental issues significantly impact life, resulting in the emergence and exacerbation of allergic asthma and other chronic respiratory infections. The main objective of this study is to suppress allergic asthma by TAK-242 from lipopolysaccharide-induced airway inflammation primarily stimulating toll-like receptor-4, and also to determine the potential mechanism of asthma eradication. The TAK-242 anti-allergic action was assured through the ovalbumin murine model of asthma via bronchial hyperresponsiveness and inflammation of the respiration tract in a pre-existing allergic inflammation paradigm. Swiss albino mice were sensitized and then challenged by ovalbumin and lipopolysaccharide for 5 days straight. TAK-242 reaction was assessed by inflammatory cytokines, and inflammatory cell count was determined from blood serum and bronchoalveolar lavage fluid, as well as group-wise regular weight assessments. After ovalbumin, lipopolysaccharide infusion, toll-like receptor-4 agonists caused a substantial increase in airway hyperresponsiveness, specific cellular inflammation, histological alterations, and immune mediator synthesis, as well as dose-related body-weight variations. A decrease in lipopolysaccharide-induced leukocyte count and Th1/Th17 related cytokines, TNF-α, and IL-6 expression through the ELISA study was particularly noticeable. Finally in treated groups, TAK-242, a TLR4/MD2 complex inhibitor, reduced airway inflammation and histopathological changes, cytokine expression, and body-weight management. TAK-242 has been found in an ovalbumin allergic asthma model to be a potential inhibitor of lipopolysaccharide-induced respiratory infection.
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Affiliation(s)
- Swamita Arora
- Amity Institute of Pharmacy, Amity University, Noida, U.P. 201303, India
| | - Priti Tagde
- Amity Institute of Pharmacy, Amity University, Noida, U.P. 201303, India.
| | - Sanjar Alam
- R.V. Northland Institute of Pharmacy, Gautam Buddh Nagar, Ghaziabad, U.P. 203207, India
| | - Wasim Akram
- R.V. Northland Institute of Pharmacy, Gautam Buddh Nagar, Ghaziabad, U.P. 203207, India
| | - Tanveer Naved
- Amity Institute of Pharmacy, Amity University, Noida, U.P. 201303, India
| | - Sangeetha Gupta
- Amity Institute of Pharmacy, Amity University, Noida, U.P. 201303, India.
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Abotsi RE, Dube FS, Rehman AM, Claassen-Weitz S, Xia Y, Simms V, Mwaikono KS, Gardner-Lubbe S, McHugh G, Ngwira LG, Kwambana-Adams B, Heyderman RS, Odland JØ, Ferrand RA, Nicol MP. Sputum bacterial load and bacterial composition correlate with lung function and are altered by long-term azithromycin treatment in children with HIV-associated chronic lung disease. Microbiome 2023; 11:29. [PMID: 36803868 PMCID: PMC9940396 DOI: 10.1186/s40168-023-01460-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 01/04/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Long-term azithromycin (AZM) treatment reduces the frequency of acute respiratory exacerbation in children and adolescents with HIV-associated chronic lung disease (HCLD). However, the impact of this treatment on the respiratory bacteriome is unknown. METHOD African children with HCLD (defined as forced expiratory volume in 1 s z-score (FEV1z) less than - 1.0 with no reversibility) were enrolled in a placebo-controlled trial of once-weekly AZM given for 48-weeks (BREATHE trial). Sputum samples were collected at baseline, 48 weeks (end of treatment) and 72 weeks (6 months post-intervention in participants who reached this timepoint before trial conclusion). Sputum bacterial load and bacteriome profiles were determined using 16S rRNA gene qPCR and V4 region amplicon sequencing, respectively. The primary outcomes were within-participant and within-arm (AZM vs placebo) changes in the sputum bacteriome measured across baseline, 48 weeks and 72 weeks. Associations between clinical or socio-demographic factors and bacteriome profiles were also assessed using linear regression. RESULTS In total, 347 participants (median age: 15.3 years, interquartile range [12.7-17.7]) were enrolled and randomised to AZM (173) or placebo (174). After 48 weeks, participants in the AZM arm had reduced sputum bacterial load vs placebo arm (16S rRNA copies/µl in log10, mean difference and 95% confidence interval [CI] of AZM vs placebo - 0.54 [- 0.71; - 0.36]). Shannon alpha diversity remained stable in the AZM arm but declined in the placebo arm between baseline and 48 weeks (3.03 vs. 2.80, p = 0.04, Wilcoxon paired test). Bacterial community structure changed in the AZM arm at 48 weeks compared with baseline (PERMANOVA test p = 0.003) but resolved at 72 weeks. The relative abundances of genera previously associated with HCLD decreased in the AZM arm at 48 weeks compared with baseline, including Haemophilus (17.9% vs. 25.8%, p < 0.05, ANCOM ω = 32) and Moraxella (1% vs. 1.9%, p < 0.05, ANCOM ω = 47). This reduction was sustained at 72 weeks relative to baseline. Lung function (FEV1z) was negatively associated with bacterial load (coefficient, [CI]: - 0.09 [- 0.16; - 0.02]) and positively associated with Shannon diversity (0.19 [0.12; 0.27]). The relative abundance of Neisseria (coefficient, [standard error]: (2.85, [0.7], q = 0.01), and Haemophilus (- 6.1, [1.2], q < 0.001) were positively and negatively associated with FEV1z, respectively. An increase in the relative abundance of Streptococcus from baseline to 48 weeks was associated with improvement in FEV1z (3.2 [1.11], q = 0.01) whilst an increase in Moraxella was associated with decline in FEV1z (-2.74 [0.74], q = 0.002). CONCLUSIONS AZM treatment preserved sputum bacterial diversity and reduced the relative abundances of the HCLD-associated genera Haemophilus and Moraxella. These bacteriological effects were associated with improvement in lung function and may account for reduced respiratory exacerbations associated with AZM treatment of children with HCLD. Video Abstract.
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Affiliation(s)
- Regina E Abotsi
- Department of Molecular and Cell Biology & Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
- Department of Pharmaceutical Microbiology, School of Pharmacy, University of Health and Allied Sciences, Ho, Ghana
| | - Felix S Dube
- Department of Molecular and Cell Biology & Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Andrea M Rehman
- International Statistics and Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK
| | - Shantelle Claassen-Weitz
- Division of Medical Microbiology, Department of Pathology, University of Cape Town, Cape Town, South Africa
| | - Yao Xia
- Marshall Centre, Division of Infection and Immunity, School of Biomedical Sciences, University of Western Australia, Perth, Australia
| | - Victoria Simms
- International Statistics and Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK
- Biomedical Research and Training Institute, Harare, Zimbabwe
| | - Kilaza S Mwaikono
- Computational Biology Group and H3ABioNet, Department of Integrative Biomedical Sciences, University of Cape Town, Cape Town, South Africa
- Department of Science and Laboratory Technology, Dar es Salaam Institute of Technology, Dar es Salaam, Tanzania
| | - Sugnet Gardner-Lubbe
- Department of Statistics and Actuarial Science, Stellenbosch University, Stellenbosch, South Africa
| | - Grace McHugh
- Biomedical Research and Training Institute, Harare, Zimbabwe
| | - Lucky G Ngwira
- Malawi-Liverpool Wellcome Trust Clinical Research Programme, Blantyre, Malawi
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Brenda Kwambana-Adams
- NIHR Global Health Research Unit on Mucosal Pathogens, Research Department of Infection, Division of Infection and Immunity, University College London, London, UK
| | - Robert S Heyderman
- NIHR Global Health Research Unit on Mucosal Pathogens, Research Department of Infection, Division of Infection and Immunity, University College London, London, UK
| | - Jon Ø Odland
- Department of Community Medicine, University of Tromsø, Tromsø, Norway
- International Research Laboratory for Reproductive Ecotoxicology (IL RET), The National Research University Higher School of Economics, Moscow, Russia
- School of Health Systems and Public Health, University of Pretoria, Pretoria, South Africa
| | - Rashida A Ferrand
- Biomedical Research and Training Institute, Harare, Zimbabwe
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, UK
| | - Mark P Nicol
- Division of Medical Microbiology, Department of Pathology, University of Cape Town, Cape Town, South Africa.
- Marshall Centre, Division of Infection and Immunity, School of Biomedical Sciences, University of Western Australia, Perth, Australia.
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Mapamba DA, Sauli E, Lalashowi J, Buza J, John J, Mwaisango Z, Tarmo P, Sabi I, Rachow A, Ntinginya NE, Mtafya B. Performance of Tuberculosis Molecular Bacterial Load Assay Compared to Alere TB-LAM in Urine of Pulmonary Tuberculosis Patients with HIV Co-Infections. Int J Mol Sci 2023; 24:ijms24043715. [PMID: 36835127 PMCID: PMC9965206 DOI: 10.3390/ijms24043715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/20/2023] [Accepted: 02/03/2023] [Indexed: 02/17/2023] Open
Abstract
Alternative tools are needed to improve the detection of M. tuberculosis (M. tb) in HIV co-infections. We evaluated the utility of Tuberculosis Molecular Bacterial Load Assay (TB-MBLA) compared to lipoarabinomannan (LAM) to detect M. tb in urine. Sputum Xpert MTB/RIF-positive patients were consented to provide urine at baseline, weeks 2, 8, 16, and 24 of treatment for TB-MBLA, culture, and LAM. Results were compared with sputum cultures and microscopy. Initial M. tb. H37Rv spiking experiments were performed to validate the tests. A total of 63 urine samples from 47 patients were analyzed. The median age (IQR) was 38 (30-41) years; 25 (53.2%) were male, 3 (6.5%) had urine for all visits, 45 (95.7%) were HIV positive, of whom 18 (40%) had CD4 cell counts below 200 cells/µL, and 33 (73.3%) were on ART at enrollment. Overall urine LAM positivity was 14.3% compared to 4.8% with TB-MBLA. Culture and microscopy of their sputum counterparts were positive in 20.6% and 12.7% of patients, respectively. Of the three patients with urine and sputum at baseline, one (33.33%) had urine TB-MBLA and LAM positive compared to 100% with sputum MGIT culture positive. Spearman's rank correction coefficient (r) between TB-MBLA and MGIT was -0.85 and 0.89 with a solid culture, p > 0.05. TB-MBLA has the promising potential to improve M. tb detection in urine of HIV-co-infected patients and complement current TB diagnostics.
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Affiliation(s)
- Daniel Adon Mapamba
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
- The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania
- Correspondence: ; Tel.: +255-25-250-3364
| | - Elingarami Sauli
- The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania
| | - Julieth Lalashowi
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
| | - Joram Buza
- The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania
| | - Joseph John
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
| | - Zawadi Mwaisango
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
| | - Peter Tarmo
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
| | - Issa Sabi
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
| | - Andrea Rachow
- Division of Infectious Diseases and Tropical Medicine, Medical Centre of the University of Munich (LMU), 80802 Munich, Germany
- German Center for Infection Research (DZIF), Partner Site Munich, 81675 Munich, Germany
| | - Nyanda Elias Ntinginya
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
| | - Bariki Mtafya
- National Institute for Medical Research—Mbeya Medical Research Centre (NIM-MMRC), Mbeya P.O. Box 2410, Tanzania
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45
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Armstrong DG, Edmonds ME, Serena TE. Point-of-care fluorescence imaging reveals extent of bacterial load in diabetic foot ulcers. Int Wound J 2023; 20:554-566. [PMID: 36708275 PMCID: PMC9885466 DOI: 10.1111/iwj.14080] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/24/2022] [Accepted: 11/28/2022] [Indexed: 01/29/2023] Open
Abstract
Elevated levels of bacteria, including biofilm, increase the risk of chronic wound infection and inhibit healing. Addressing asymptomatic high bacterial loads is challenged by a lack of clinical terminology and diagnostic tools. This post-hoc multicenter clinical trial analysis of 138 diabetic foot ulcers investigates fluorescence (FL)-imaging role in detecting biofilm-encased and planktonic bacteria in wounds at high loads. The sensitivity and specificity of clinical assessment and FL-imaging were compared across bacterial loads of concern (104 -109 CFU/g). Quantitative tissue culture confirmed the total loads. Bacterial presence was confirmed in 131/138 ulcers. Of these, 93.9% had loads >104 CFU/g. In those wounds, symptoms of infection were largely absent and did not correlate with, or increase proportionately with, bacterial loads at any threshold. FL-imaging increased sensitivity for the detection of bacteria across loads 104 -109 (P < .0001), peaking at 92.6% for >108 CFU/g. Imaging further showed that 84.2% of ulcers contained high loads in the periwound region. New terminology, chronic inhibitory bacterial load (CIBL), describes frequently asymptomatic, high bacterial loads in diabetic ulcers and periwound tissues, which require clinical intervention to prevent sequelae of infection. We anticipate this will spark a paradigm shift in assessment and management, enabling earlier intervention along the bacterial-infection continuum and supporting improved wound outcomes.
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Affiliation(s)
- David G. Armstrong
- Department of SurgeryKeck School of Medicine of University of Southern CaliforniaLos AngelesCaliforniaUSA
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46
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Munser AS, Trost M, Schröder S, Graf M, Rosenbaum MA, Tünnermann A. Analysis of very low bacterial counts in small sample volumes using angle-resolved light scattering. Appl Opt 2023; 62:411-418. [PMID: 36630241 DOI: 10.1364/ao.472968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 10/30/2022] [Indexed: 06/17/2023]
Abstract
Because of its high sensitivity to even small objects and the quick measurement principle, angle-resolved scattering (ARS) measurements exhibit a promising potential as a rapid analysis tool for bacterial cells at small sample sizes and very low numbers of cells. In this study, investigations on scattered light from various bacterial cell samples revealed applicability down to single cell levels, which is a huge benefit compared to conventional methods that depend on time-consuming cellular growth over several hours or even days. With the proposed setup and data analysis method, it is possible to detect scatter differences among cell types, together with the cell concentration.
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47
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Wójcicki M, Świder O, Gientka I, Błażejak S, Średnicka P, Shymialevich D, Cieślak H, Wardaszka A, Emanowicz P, Sokołowska B, Juszczuk-Kubiak E. Effectiveness of a Phage Cocktail as a Potential Biocontrol Agent against Saprophytic Bacteria in Ready-To-Eat Plant-Based Food. Viruses 2023; 15:172. [PMID: 36680211 PMCID: PMC9860863 DOI: 10.3390/v15010172] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/01/2023] [Accepted: 01/05/2023] [Indexed: 01/11/2023] Open
Abstract
This study aimed to evaluate the effectiveness of the phage cocktail to improve the microbiological quality of five different mixed-leaf salads: rucola, mixed-leaf salad with carrot, mixed-leaf salad with beetroot, washed and unwashed spinach, during storage in refrigerated conditions. Enterobacterales rods constituted a significant group of bacteria in the tested products. Selected bacteria were tested for antibiotic resistance profiles and then used to search for specific bacteriophages. Forty-three phages targeting bacteria dominant in mixed-leaf salads were isolated from sewage. Their titer was determined, and lytic activity was assessed using the Bioscreen C Pro automated growth analyzer. Two methods of phage cocktail application including spraying, and an absorption pad were effective for rucola, mixed leaf salad with carrot, and mixed leaf salad with beetroot. The maximum reduction level after 48 h of incubation reached 99.9% compared to the control sample. In washed and unwashed spinach, attempts to reduce the number of microorganisms did not bring the desired effect. The decrease in bacteria count in the lettuce mixes depended on the composition of the autochthonous saprophytic bacteria species. Both phage cocktail application methods effectively improved the microbiological quality of minimally processed products. Whole-spectral phage cocktail application may constitute an alternative food microbiological quality improvement method without affecting food properties.
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Affiliation(s)
- Michał Wójcicki
- Laboratory of Biotechnology and Molecular Engineering, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Olga Świder
- Department of Food Safety and Chemical Analysis, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Iwona Gientka
- Department of Biotechnology and Food Microbiology, Institute of Food Sciences, Warsaw University of Life Sciences (WULS-SGGW), Nowoursynowska 166 Street, 02-776 Warsaw, Poland
| | - Stanisław Błażejak
- Department of Biotechnology and Food Microbiology, Institute of Food Sciences, Warsaw University of Life Sciences (WULS-SGGW), Nowoursynowska 166 Street, 02-776 Warsaw, Poland
| | - Paulina Średnicka
- Laboratory of Biotechnology and Molecular Engineering, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Dziyana Shymialevich
- Culture Collection of Industrial Microorganisms—Microbiological Resources Center, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Hanna Cieślak
- Culture Collection of Industrial Microorganisms—Microbiological Resources Center, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Artur Wardaszka
- Laboratory of Biotechnology and Molecular Engineering, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Paulina Emanowicz
- Laboratory of Biotechnology and Molecular Engineering, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Barbara Sokołowska
- Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Edyta Juszczuk-Kubiak
- Laboratory of Biotechnology and Molecular Engineering, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
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Shymialevich D, Wójcicki M, Wardaszka A, Świder O, Sokołowska B, Błażejak S. Application of Lytic Bacteriophages and Their Enzymes to Reduce Saprophytic Bacteria Isolated from Minimally Processed Plant-Based Food Products-In Vitro Studies. Viruses 2022; 15:9. [PMID: 36680050 PMCID: PMC9865725 DOI: 10.3390/v15010009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/16/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022] Open
Abstract
The aim of this study was to isolate phage enzymes and apply them in vitro for eradication of the dominant saprophytic bacteria isolated from minimally processed food. Four bacteriophages-two Enterobacter-specific and two Serratia-specific, which produce lytic enzymes-were used in this research. Two methods of phage enzyme isolation were tested, namely precipitation with acetone and ultracentrifugation. It was found that the number of virions could be increased almost 100 times due to the extension of the cultivation time (72 h). The amplification of phage particles and lytic proteins was dependent on the time of cultivation. Considering the influence of isolated enzymes on the growth kinetics of bacterial hosts, proteins isolated with acetone after 72-hour phage propagation exhibited the highest inhibitory effect. The reduction of bacteria count was dependent on the concentration of enzymes in the lysates. The obtained results indicate that phages and their lytic enzymes could be used in further research aiming at the improvement of microbiological quality and safety of minimally processed food products.
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Affiliation(s)
- Dziyana Shymialevich
- Culture Collection of Industrial Microorganisms—Microbiological Resources Center, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Michał Wójcicki
- Laboratory of Biotechnology and Molecular Engineering, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Artur Wardaszka
- Laboratory of Biotechnology and Molecular Engineering, Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Olga Świder
- Department of Food Safety and Chemical Analysis, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Barbara Sokołowska
- Department of Microbiology, Prof. Waclaw Dabrowski Institute of Agricultural and Food Biotechnology—State Research Institute, Rakowiecka 36 Street, 02-532 Warsaw, Poland
| | - Stanisław Błażejak
- Department of Biotechnology and Food Microbiology, Institute of Food Sciences, Warsaw University of Life Sciences (WULS–SGGW), Nowoursynowska 166 Street, 02-776 Warsaw, Poland
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Rocha PK, Rickard CM, Gales AC, Sincero TCM, Ray-Barruel G, Ullman AJ, Dalcin CB, Pedreira MLG. Disinfection of needleless connectors to reduce Staphylococcus aureus bacterial load. Br J Nurs 2022; 31:S26-S31. [PMID: 36306235 DOI: 10.12968/bjon.2022.31.19.s26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
HIGHLIGHTS Compare effectiveness of chemical disinfectants in reducing S. aureus. Five disinfectants reduced the bacterial load, especially chlorhexidine solutions. Focus on Brazilian clinical practice of needleless connector disinfection. PURPOSE This study aimed to gain further knowledge about the comparative effectiveness of chemical disinfectants in reducing the bacterial load of NCs inoculated with S. aureus. METHODS Disinfection of needleless connectors was undertaken in vitro against S. aureus comparing 70% isopropyl alcohol (IPA), 70% ethanol, 0.5% and 2% chlorhexidine in 70% IPA applied with gauze, and 70% IPA single-use cap (Site-Scrub®). RESULTS All disinfectants reduced the bacterial load (P<0.001), especially the chlorhexidine solutions. Mechanical friction should follow guidelines. CONCLUSION This study found that all tested disinfectants effectively reduced the bacterial load and more clinical studies must be developed with a focus on the Brazilian clinical practice of needleless connector disinfection.
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Affiliation(s)
- Patrícia Kuerten Rocha
- Universidade Federal de Santa Catarina, Nursing Department, Paediatric Area, Gepesca Laboratory, Florianópolis, Brazil; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil; Alliance for Vascular Access Teaching and Research, School of Nursing and Midwifery, Griffith University, Brisbane, Australia
| | - Claire M Rickard
- Alliance for Vascular Access Teaching and Research, School of Nursing and Midwifery, Griffith University, Brisbane, Australia; School of Nursing, Midwifery and Social Work, The University of Queensland, Brisbane, Australia; Nursing and Midwifery Research Centre, Herston Infectious Diseases Institute, Metro North Health, Brisbane, Australia
| | - Ana Cristina Gales
- Universidade Federal de São Paulo, Paulista School of Medicine, Internal Medicine Department, Division of Infectious Diseases, Alert Laboratory, São Paulo, Brazil
| | - Thaís Cristine Marques Sincero
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil; Universidade Federal de Santa Catarina, Health Sciences Centre, Clinical Analysis Department, Molecular Microbiology Laboratory, Florianópolis, Brazil
| | - Gillian Ray-Barruel
- Alliance for Vascular Access Teaching and Research, School of Nursing and Midwifery, Griffith University, Brisbane, Australia; QEII Jubilee Hospital, Brisbane, Australia
| | - Amanda J Ullman
- Alliance for Vascular Access Teaching and Research, School of Nursing and Midwifery, Griffith University, Brisbane, Australia; School of Nursing, Midwifery and Social Work, The University of Queensland, Brisbane, Australia; Queensland Children's Hospital, Brisbane, Australia
| | - Camila Biazus Dalcin
- Universidade Federal de Santa Catarina, Nursing Department, Paediatric Area, Gepesca Laboratory, Florianópolis, Brazil; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brasília, Brazil
| | - Mavilde L Gonçalves Pedreira
- National Council for Scientific and Technological Development (CNPq), Brazil; Alliance for Vascular Access Teaching and Research, School of Nursing and Midwifery, Griffith University, Brisbane, Australia; Universidade Federal de São Paulo, Paediatric Nursing Department, LEEnf Laboratory, SEGTEC Research Group, Sao Paulo, Brazil
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50
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Zhang JW, Pan LQ, Tu K. Growth Prediction of the Total Bacterial Count in Freshly Squeezed Strawberry Juice during Cold Storage Using Electronic Nose and Electronic Tongue. Sensors (Basel) 2022; 22:8205. [PMID: 36365901 PMCID: PMC9654945 DOI: 10.3390/s22218205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 10/21/2022] [Accepted: 10/21/2022] [Indexed: 06/15/2023]
Abstract
The growth models of total bacterial count in freshly squeezed strawberry juice were established by gas and taste sensors in this paper. By selecting the optimal sensors and fusing the response values, the Modified Gompertz, Logistic, Huang and Baranyi models were used to predict and simulate the growth of bacteria. The results showed that the R2 values for fitting the growth model of total bacterial count of the sensor S7 (an electronic nose sensor), of sweetness and of the principal components scores were 0.890-0.944, 0.861-0.885 and 0.954-0.964, respectively. The correlation coefficients, or R-values, between models fitted by the response values and total bacterial count ranged from 0.815 to 0.999. A single system of electronic nose (E-nose) or electronic tongue (E-tongue) sensors could be used to predict the total bacterial count in freshly squeezed strawberry juice during cold storage, while the higher rate was gained by the combination of these two systems. The fusion of E-nose and E-tongue had the best fitting-precision in predicting the total bacterial count in freshly squeezed strawberry juice during cold storage. This study proved that it was feasible to predict the growth of bacteria in freshly squeezed strawberry juice using E-nose and E-tongue sensors.
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Affiliation(s)
| | | | - Kang Tu
- Correspondence: ; Tel./Fax: +86-025-84399016
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