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Souza BMN, Miñán AG, Brambilla IR, Pinto JG, Garcia MT, Junqueira JC, Ferreira-Strixino J. Effects of antimicrobial photodynamic therapy with photodithazine® on methicillin-resistant Staphylococcus aureus (MRSA): Studies in biofilms and experimental model with Galleria mellonella. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2024; 252:112860. [PMID: 38330692 DOI: 10.1016/j.jphotobiol.2024.112860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 01/15/2024] [Accepted: 02/01/2024] [Indexed: 02/10/2024]
Abstract
Staphylococcus aureus infections are a severe health problem due to the high mortality rate. Conventional treatment of these infections is via the administration of antibiotics. However, its indiscriminate use can select resistant microorganisms. Thus, it is necessary to develop alternatives for antibiotic therapy. Antimicrobial Photodynamic Therapy (aPDT), a therapeutic method that associates a photosensitizer (PS), a light source with adequate wavelength to the PS, interacts with molecular oxygen generating reactive oxygen species responsible for cell inactivation, is a viable alternative. This work aimed to analyze, in vitro and in vivo, the action of aPDT with PS Photodithazine® (PDZ) on the methicillin-resistant S. aureus (MRSA) strain. In the in vitro method, the S. aureus biofilm was incubated with PDZ at 50 and 75 μg.mL-1 for 15 min, adopting the light dose of 25, 50, and 100 J/cm2. In addition, PS interaction, formation of reactive oxygen species (ROS), bacterial metabolism, adhesion, bacterial viability, and biofilm structure were evaluated by scanning electron microscopy. Subsequently, the strain was inoculated into models of Galleria mellonella, and the survival curve, health scale, blood cell analysis, and CFU/mL of S. aureus in the hemolymph were analyzed after aPDT. In the in vitro results, bacterial reduction was observed in the different PDZ concentrations, highlighting the parameters of 75 μg.mL-1 of PDZ and 100 J/cm2. As for in vivo results, aPDT increased survival and stimulated the immune system of G. mellonella infected by S. aureus. aPDT proved effective in both models, demonstrating its potential as an alternative therapy in treating MRSA bacterial infections.
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Affiliation(s)
- Beatriz Müller N Souza
- Photobiology Applied to Health (PhotoBioS Lab), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, São Paulo, Brazil
| | - Alejandro Guillermo Miñán
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata 1900, Argentina.
| | - Isabelle Ribeiro Brambilla
- Photobiology Applied to Health (PhotoBioS Lab), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, São Paulo, Brazil
| | - Juliana Guerra Pinto
- Photobiology Applied to Health (PhotoBioS Lab), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, São Paulo, Brazil.
| | - Maíra Terra Garcia
- Department of Biosciences and Oral Diagnosis, Universidade Estadual Paulista (Unesp), Institute of Science and Technology (ICT), São José dos Campos, São Paulo, Brazil
| | - Juliana Campos Junqueira
- Department of Biosciences and Oral Diagnosis, Universidade Estadual Paulista (Unesp), Institute of Science and Technology (ICT), São José dos Campos, São Paulo, Brazil.
| | - Juliana Ferreira-Strixino
- Photobiology Applied to Health (PhotoBioS Lab), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, São Paulo, Brazil.
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Bastakoti S, Pesonen M, Ajayi C, Julin K, Corander J, Johannessen M, Hanssen AM. Co-culturing with Streptococcus anginosus alters Staphylococcus aureus transcriptome when exposed to tonsillar cells. Front Cell Infect Microbiol 2024; 14:1326730. [PMID: 38333035 PMCID: PMC10850355 DOI: 10.3389/fcimb.2024.1326730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 01/04/2024] [Indexed: 02/10/2024] Open
Abstract
Introduction Improved understanding of Staphylococcus aureus throat colonization in the presence of other co-existing microbes is important for mapping S. aureus adaptation to the human throat, and recurrence of infection. Here, we explore the responses triggered by the encounter between two common throat bacteria, S. aureus and Streptococcus anginosus, to identify genes in S. aureus that are important for colonization in the presence of human tonsillar epithelial cells and S. anginosus, and further compare this transcriptome with the genes expressed in S. aureus as only bacterium. Methods We performed an in vitro co-culture experiment followed by RNA sequencing to identify interaction-induced transcriptional alterations and differentially expressed genes (DEGs), followed by gene enrichment analysis. Results and discussion A total of 332 and 279 significantly differentially expressed genes with p-value < 0.05 and log2 FoldChange (log2FC) ≥ |2| were identified in S. aureus after 1 h and 3 h co-culturing, respectively. Alterations in expression of various S. aureus survival factors were observed when co-cultured with S. anginosus and tonsillar cells. The serine-aspartate repeat-containing protein D (sdrD) involved in adhesion, was for example highly upregulated in S. aureus during co-culturing with S. anginosus compared to S. aureus grown in the absence of S. anginosus, especially at 3 h. Several virulence genes encoding secreted proteins were also highly upregulated only when S. aureus was co-cultured with S. anginosus and tonsillar cells, and iron does not appear to be a limiting factor in this environment. These findings may be useful for the development of interventions against S. aureus throat colonization and could be further investigated to decipher the roles of the identified genes in the host immune response in context of a throat commensal landscape.
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Affiliation(s)
- Srijana Bastakoti
- Department of Medical Biology, Research group for Host-Microbe Interaction (HMI), UiT – The Arctic University of Norway, Tromsø, Norway
| | - Maiju Pesonen
- Oslo Centre of Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway
| | - Clement Ajayi
- Department of Medical Biology, Research group for Host-Microbe Interaction (HMI), UiT – The Arctic University of Norway, Tromsø, Norway
| | - Kjersti Julin
- Department of Medical Biology, Research group for Host-Microbe Interaction (HMI), UiT – The Arctic University of Norway, Tromsø, Norway
| | - Jukka Corander
- Department of Biostatistics, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
- Parasites and Microbes, Wellcome Sanger Institute, Cambridgeshire, United Kingdom
- Helsinki Institute of Information Technology, Department of Mathematics and Statistics, University of Helsinki, Helsinki, Finland
| | - Mona Johannessen
- Department of Medical Biology, Research group for Host-Microbe Interaction (HMI), UiT – The Arctic University of Norway, Tromsø, Norway
| | - Anne-Merethe Hanssen
- Department of Medical Biology, Research group for Host-Microbe Interaction (HMI), UiT – The Arctic University of Norway, Tromsø, Norway
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Bastakoti S, Ajayi C, Julin K, Johannessen M, Hanssen AM. Exploring differentially expressed genes of Staphylococcus aureus exposed to human tonsillar cells using RNA sequencing. BMC Microbiol 2023; 23:185. [PMID: 37438716 PMCID: PMC10337072 DOI: 10.1186/s12866-023-02919-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Accepted: 06/28/2023] [Indexed: 07/14/2023] Open
Abstract
BACKGROUND The nose and the throat are the most predominant colonizing sites of Staphylococcus aureus, and colonization is a risk factor for infection. Nasal colonization is well described; however, we have limited knowledge about S. aureus throat colonization. The main objective of this study was to explore differentially expressed genes (DEGs) in S. aureus throat isolate TR145 exposed to human tonsil epithelial cells (HTEpiC) by using RNA sequencing (RNA-seq) and pathway analysis. DEGs in S. aureus at 1 or 3 hours (h) interaction with its host were explored. RESULTS S. aureus was co-cultured in absence and presence of tonsillar cells at 1 or 3 h. Over the 3 h time frame, the bacteria multiplied, but still caused only minor cytotoxicity. Upon exposure to tonsillar cell line, S. aureus changed its transcriptomic profile. A total of 508 DEGs were identified including unique (1 h, 160 DEGs and 3 h, 78 DEGs) and commonly shared genes (1 and 3 h, 270 DEGs). Among the DEGs, were genes encoding proteins involved in adhesion and immune evasion, as well as iron acquisition and transport. Reverse transcription qPCR was done on selected genes, and the results correlated with the RNA-seq data. CONCLUSION We have shown the suitability of using HTEpiC as an in vitro model for investigating key determinants in S. aureus during co-incubation with host cells. Several DEGs were unique after 1 or 3 h exposure to host cells, while others were commonly expressed at both time points. As their expression is induced upon meeting with the host, they might be explored further for future targets for intervention to prevent either colonization or infection in the throat.
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Affiliation(s)
- Srijana Bastakoti
- Department of Medical Biology, Host-Microbe Interaction (HMI) research group, UiT - The Arctic University of Norway, Tromsø, Norway.
| | - Clement Ajayi
- Department of Medical Biology, Host-Microbe Interaction (HMI) research group, UiT - The Arctic University of Norway, Tromsø, Norway
- Center for Research and Education, University Hospital of North Norway (UNN), Tromsø, Norway
| | - Kjersti Julin
- Department of Medical Biology, Host-Microbe Interaction (HMI) research group, UiT - The Arctic University of Norway, Tromsø, Norway
| | - Mona Johannessen
- Department of Medical Biology, Host-Microbe Interaction (HMI) research group, UiT - The Arctic University of Norway, Tromsø, Norway
- Center for Research and Education, University Hospital of North Norway (UNN), Tromsø, Norway
| | - Anne-Merethe Hanssen
- Department of Medical Biology, Host-Microbe Interaction (HMI) research group, UiT - The Arctic University of Norway, Tromsø, Norway.
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Zajmi A, Shiranee F, Gee Hoon Tang S, A.M. Alhoot M, Abdul Karim S. Multidrug-Resistant Staphylococcus aureus as Coloniser in Healthy Individuals. Infect Dis (Lond) 2022. [DOI: 10.5772/intechopen.108410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Staphylococcus aureus is a common human pathogen that can cause mild superficial infections to deep-seated abscesses and sepsis. One of the characteristics of S. aureus is the ability to colonise healthy individuals while leaving them asymptomatic. These carriers’ risk harbouring an antibiotic-resistant strain that may be harmful to the individual and the community. S. aureus carriage in healthcare personnel is being studied extensively in many parts of the world. However, the relationship between colonisation and disease among those with no previous exposure to healthcare remains untouched. Colonisation of the nasal cavity and its surrounding by pathogenic organisms such as S. aureus leads to the increased risk of infection. Hospital-acquired infections associated with S. aureus infections are common and studies related to these types of infections among various study groups are largely documented. However, over the last decade, an increase in community-associated methicillin-resistant S. aureus has been noted, increasing the need to identify the prevalence of the organism among healthy individuals and assessing the antibiotic resistance patterns. Systemic surveillance of the community for colonisation of S. aureus and identifying the antibiotic-resistant pattern is critical to determine the appropriate empiric antibiotic treatment.
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Zhang XD, Gu B, Usman M, Tang JW, Li ZK, Zhang XQ, Yan JW, Wang L. Recent Progress in the Diagnosis of Staphylococcus in Clinical Settings. Infect Dis (Lond) 2022. [DOI: 10.5772/intechopen.108524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Staphylococci are mainly found on the skin or in the nose. These bacteria are typically friendly, causing no harm to healthy individuals or resulting in only minor issues that can go away on their own. However, under certain circumstances, staphylococcal bacteria could invade the bloodstream, affect the entire body, and lead to life-threatening problems like septic shock. In addition, antibiotic-resistant Staphylococcus is another issue because of its difficulty in the treatment of infections, such as the notorious methicillin-resistant Staphylococcus aureus (MRSA) which is resistant to most of the currently known antibiotics. Therefore, rapid and accurate diagnosis of Staphylococcus and characterization of the antibiotic resistance profiles are essential in clinical settings for efficient prevention, control, and treatment of the bacteria. This chapter highlights recent advances in the diagnosis of Staphylococci in clinical settings with a focus on the advanced technique of surface-enhanced Raman spectroscopy (SERS), which will provide a framework for the real-world applications of novel diagnostic techniques in medical laboratories via bench-top instruments and at the bedside through point-of-care devices.
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Bo ZM, Tan WK, Chong CSC, Lye MS, Parmasivam S, Pang ST, Satkunananthan SE, Chong HY, Malek A, Al-khazzan BAAM, Sim BLH, Lee CKC, Lim RLH, Lim CSY. Respiratory microorganisms in acute pharyngitis patients: Identification, antibiotic prescription patterns and appropriateness, and antibiotic resistance in private primary care, central Malaysia. PLoS One 2022; 17:e0277802. [PMID: 36395327 PMCID: PMC9671416 DOI: 10.1371/journal.pone.0277802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 11/03/2022] [Indexed: 11/18/2022] Open
Abstract
Acute pharyngitis (AP) is a common reason for private primary care consultations, thus providing an avenue for widespread antibiotic intake among the community. However, there is limited data on the antibiotic prescription appropriateness and resistance information in the Malaysian private primary care setting, therefore, this study aimed to investigate the prevalence of isolated viruses and bacteria, antibiotic resistance patterns, antibiotic prescription patterns and appropriateness by general practitioners (GPs) and factors affecting antibiotic resistance and antibiotic prescription patterns. To investigate, a cross-sectional study was conducted among 205 patients presenting with AP symptoms at private primary care clinics in central Malaysia from 3rd January 2016 to 30th November 2016. Throat swabs were collected from 205 AP patients for two purposes: (i) the detection of four common respiratory viruses associated with AP via reverse-transcription real-time PCR (qRT-PCR); and (ii) bacterial identification using matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS). Bacterial isolates were then subjected to antibiotic susceptibility screening and McIsaac scoring was calculated post-prescription based on GP selection of criteria. Generalized estimating equations analysis with multiple logistic regression was conducted to identify factors associated with presence of virus and antibiotic prescription. The results showed that 95.1% (195/205) of patients had at least one of the four viruses, with rhinovirus (88.5%) being the most prevalent, followed by adenovirus (74.9%), influenza A virus (4.6%) and enterovirus (2.1%). A total of 862 non-repetitive colonies were isolated from the culture of throat swabs from 205 patients who were positive for bacteria. From a total of 22 genera, Streptococcus constitutes the most prevalent bacteria genus (40.9%), followed by Neisseria (20%), Rothia (13.0%), Staphylococcus (11%) and Klebsiella (4.9%). Only 5 patients carried group A beta-hemolytic streptococci (GABHS). We also report the presence of vancomycin-resistant S. aureus or VRSA (n = 9, 10.1%) among which one isolate is a multidrug-resistant methicillin-resistant S. aureus (MDR-MRSA), while 54.1% (n = 111) were found to carry at least one antibiotic-resistant bacteria species. Application of the McIsaac scoring system indicated that 87.8% (n = 180) of patients should not be prescribed antibiotics as the majority of AP patients in this study had viral pharyngitis. The antibiotic prescription appropriateness by applying post-prescription McIsaac scoring was able to rule out GABHS pharyngitis in this sample with a GABHS culture-positive sensitivity of 40% (n = 2/5) and specificity of 90% (180/200). In conclusion, antibiotic-resistant throat isolates and over-prescription of antibiotics were observed and McIsaac scoring system is effective in guiding GPs to determine occurrences of viral pharyngitis to reduce unnecessary antibiotic prescription.
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Affiliation(s)
- Zhuang Mian Bo
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | - Wei Keat Tan
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | | | - Munn Sann Lye
- Faculty of Medicine and Health Sciences, Formerly Department of Community Medicine, Universiti Putra Malaysia
| | - Seshatharran Parmasivam
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | - Shu Ting Pang
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | | | - Hui Yee Chong
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | - Ameen Malek
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | | | | | | | - Renee Lay Hong Lim
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | - Crystale Siew Ying Lim
- Faculty of Applied Sciences, Department of Biotechnology, UCSI University, Cheras, Kuala Lumpur, Malaysia
- * E-mail:
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Molecular Characterization of Staphylococcus aureus Strains Isolated from Mobile Phones. Microorganisms 2022; 10:microorganisms10030669. [PMID: 35336244 PMCID: PMC8950573 DOI: 10.3390/microorganisms10030669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/16/2022] [Accepted: 03/18/2022] [Indexed: 12/04/2022] Open
Abstract
The widespread use of mobile phones (MP) among healthcare personnel might be considered as an important source of contamination. One of the most pathogenic bacteria to humans is Staphylococcus aureus, which can be transmitted through the constant use of MP. Nevertheless, which specific type of strains are transmitted and which are their sources have not been sufficiently studied. The aim of this study is to determine the source of contamination of MP and characterize the corresponding genotypic and phenotypic properties of the strains found. Nose, pharynx, and MP samples were taken from a group of health science students. We were able to determinate the clonality of the isolated strains by pulsed-field gel electrophoresis (PFGE) and spa gene typing (spa-type). Adhesin and toxin genes were detected, and the capacity of biofilm formation was determined. Several of the MP exhibited strains of S. aureus present in the nose and/or pharynx of their owners. methicillin-susceptible Staphylococcus aureus (MSSA), hospital-acquired methicillin-resistant S. aureus (HA-MRSA), and community-acquired methicillin-resistant S. aureus (CA-MRSA) strains were found, which indicated a variety of genotypes. This study concludes that MP can be contaminated with the strains of S. aureus present in the nose and/or pharynx of the owners; these strains can be of different types and there is no dominant genotype.
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Mohd Ramli SS, Mat Baki M. Glottic Staphylococcus aureus in a patient with systemic lupus erythematosus: videolaryngostroboscopic characteristics. BMJ Case Rep 2022; 15:e245840. [PMID: 35228218 PMCID: PMC8886378 DOI: 10.1136/bcr-2021-245840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/20/2022] [Indexed: 11/04/2022] Open
Abstract
Systemic lupus erythematous (SLE) is an autoimmune disease commonly treated with steroid which leads to immunosuppression and increased susceptibility to infection. Chronic laryngitis with whitish lesion on the true vocal fold in SLE may be caused by opportunistic organisms, such as tuberculous, fungal and Staphylococcus aureus infections. Videolaryngostroboscopy may be helpful in leading to the diagnosis and optimum treatment of glottic S. aureus A woman in her 40s with SLE presented with progressively worsening hoarseness for 2 months, accompanied by sore throat and odynophagia. Videoendoscopy showed erythematous and oedematous bilateral vocal fold with whitish lesion seen at the edge of middle one-third while the videolaryngostroboscopic evaluation showed there was severe asymmetry of the bilateral vocal folds, with severely reduced amplitude during phonation where the vocal cords were not vibrating, aperiodic vibratory cycles and 'always open', incomplete closure of vocal cord pattern. Later, endolaryngeal microsurgery and biopsy of the lesion confirmed of glottic S. aureus Her symptoms and followed up videolaryngostroboscopy showed resolution to normal findings after 6 weeks of cloxacillin. S. aureus infection of the glottis is a differential diagnosis in a chronic laryngitis with leucoplakic lesion in an immunosuppressive patient. Videolaryngostroboscopy has an important role in diagnosis, evaluation and treatment decision.
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Affiliation(s)
- Siti Sarah Mohd Ramli
- Department of Otorhinolarynology-Head and Neck Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur, Malaysia
| | - Marina Mat Baki
- Department of Otorhinolarynology-Head and Neck Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur, Malaysia
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Exebacase: A Novel Approach to the Treatment of Staphylococcal Infections. Drugs R D 2022; 22:113-117. [PMID: 35175568 PMCID: PMC9167414 DOI: 10.1007/s40268-022-00383-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2022] [Indexed: 11/04/2022] Open
Abstract
Lysins are bacteriophage-derived enzymes that degrade essential components of bacteria. Exebacase (Lysin CF-301) is an attractive antimicrobial agent because it demonstrates rapid bacteriolytic activity against staphylococcal species, including Staphylococcus aureus, has a low resistance profile, eradicates biofilms, and acts synergistically with other antibiotics. Combinations including exebacase and standard of care antibiotics represent an alternative to antibiotic monotherapies currently used to treat invasive staphylococcal infections. This manuscript reviews what is known about exebacase and explores how this novel agent may be used in the future to treat human bacterial pathogens.
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Investigation of Virulence Genes of Staphylococcus aureus Isolated from Sterile Body Fluid Samples and Their Correlation with Clinical Symptoms and Outcomes. THE CANADIAN JOURNAL OF INFECTIOUS DISEASES & MEDICAL MICROBIOLOGY = JOURNAL CANADIEN DES MALADIES INFECTIEUSES ET DE LA MICROBIOLOGIE MEDICALE 2022; 2021:5354747. [PMID: 34987680 PMCID: PMC8720599 DOI: 10.1155/2021/5354747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/15/2021] [Indexed: 12/31/2022]
Abstract
Staphylococcus aureus is the major pathogen causing nosocomial human infections and produces a variety of virulence factors that contribute to its ability to colonize and cause diseases. This study was conducted to investigate the virulence genes in S. aureus isolated from sterile body fluid samples and their correlation with clinical symptoms and outcomes. The VITEK 2® Compact system was used to perform biochemical identification and antimicrobial susceptibility tests on 33 S. aureus isolates. Virulence genes were amplified using multiplex PCR. The virulence gene patterns were analyzed by systematic cluster analysis. The frequency of methicillin-resistant S. aureus was 45.45%, and 17 virulence genes were identified. Genes encoding hemolysins showed high frequencies. The frequencies of hla, hlb, hld, and hlgB were 93.94% and that of the luk-F/S-PV was 21.21%. Except for the frequency of splB (51.52%), the remaining genes encoding invasive proteases showed frequencies greater than 81.82%. Among the patients, 100.00% had undergone invasive medical procedures and 24.00% had been treated with more than three types of antibiotic drugs. Invasive medical procedures are the main causes of infection. Resistance to antibiotic drugs and the status of carrying virulence genes were highly related to clinical symptoms and outcomes.
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Baroja I, Guerra S, Coral-Almeida M, Ruíz A, Galarza JM, de Waard JH, Bastidas-Caldes C. Methicillin-Resistant Staphylococcus aureus Nasal Colonization Among Health Care Workers of a Tertiary Hospital in Ecuador and Associated Risk Factors. Infect Drug Resist 2021; 14:3433-3440. [PMID: 34471363 PMCID: PMC8403571 DOI: 10.2147/idr.s326148] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 08/07/2021] [Indexed: 12/19/2022] Open
Abstract
Background Methicillin-resistant Staphylococcus aureus (MRSA) is resistant to most of the commonly used antibiotics and is therefore a public health issue. Colonization with MRSA is a risk factor for infection or transmission. Purpose To determine the prevalence of colonization with Staphylococcus aureus (SA) and MRSA strains in health care workers (HCWs) at a tertiary hospital in Ecuador and to determine the risk factors associated with carriage. Methods Out of a cohort of 3800 HCWs, 481 individuals from different hospital departments were randomly selected, and a single nasal swab was collected. Detection of SA and MRSA was carried out with the LightCycler® MRSA Advanced Test. A questionnaire was performed that gathered demographic and occupational information of the participants to determine risk factors for MRSA colonization. Statistical analysis was performed with univariate and multivariate analysis and the R-software version 4.0.2. Results Colonization with SA and MRSA occurred in respectively 23.7% (95% CI, 22.7–24.6) and 5% (95% CI, 3.39–7.58) of the individuals. The multivariate analysis showed that being older in age (OD 1.09) and being male (OD 2.78) were risk factors for SA and MRSA colonization (p-value < 0.001). Previous use of antibiotics or the use of nasal ointments diminished the colonization rates of SA (24% versus 3.7% and 10.1% respectively). Conclusion About 20% of the HCWs who were colonized with SA were colonized with MRSA, representing a risk for nosocomial infections and hospital outbreaks. Active monitoring and a decolonization treatment of the HCWs can reduce these risks.
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Affiliation(s)
- Isabel Baroja
- Facultad de Ingenierías y Ciencias Aplicadas, Biotecnología, Universidad de Las Américas, Quito, Ecuador.,Unidad Técnica de Genética Molecular, Hospital de Especialidades Carlos Andrade Marín, Quito, Ecuador
| | - Sara Guerra
- Facultad de Ingenierías y Ciencias Aplicadas, Biotecnología, Universidad de Las Américas, Quito, Ecuador.,Unidad Técnica de Genética Molecular, Hospital de Especialidades Carlos Andrade Marín, Quito, Ecuador
| | - Marco Coral-Almeida
- Grupo de Bio-Quimioinformatica, Facultad de Ciencias de la Salud, Universidad de Las Américas, Quito, Ecuador
| | - Alejandra Ruíz
- Unidad Técnica de Genética Molecular, Hospital de Especialidades Carlos Andrade Marín, Quito, Ecuador.,IESS Quito Sur General Hospital, Institutional Coordination of Epidemiological Surveillance and Infectology, Molecular Microbiology, Quito, Ecuador.,Facultad de Ciencias Médicas, Universidad Central del Ecuador, Quito, Ecuador
| | - Juan Miguel Galarza
- Unidad Técnica de Genética Molecular, Hospital de Especialidades Carlos Andrade Marín, Quito, Ecuador.,Unidad de Biociencias, Gerencia de Molecular y Oncodiagnóstico, SIMED S.A., Quito, Ecuador
| | - Jacobus H de Waard
- One Health Research Group, Facultad de Ingenierías y Ciencias Aplicadas, Biotecnología, Universidad de Las Américas, Quito, Ecuador
| | - Carlos Bastidas-Caldes
- Facultad de Ingenierías y Ciencias Aplicadas, Biotecnología, Universidad de Las Américas, Quito, Ecuador.,One Health Research Group, Facultad de Ingenierías y Ciencias Aplicadas, Biotecnología, Universidad de Las Américas, Quito, Ecuador.,Programa de Doctorado en Salud Pública y Animal, Universidad de Extremadura, Extremadura, España
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Souza BMN, Pinto JG, Pereira AHC, Miñán AG, Ferreira-Strixino J. Efficiency of Antimicrobial Photodynamic Therapy with Photodithazine ® on MSSA and MRSA Strains. Antibiotics (Basel) 2021; 10:antibiotics10070869. [PMID: 34356790 PMCID: PMC8300773 DOI: 10.3390/antibiotics10070869] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/16/2021] [Accepted: 04/27/2021] [Indexed: 12/15/2022] Open
Abstract
Staphylococccus aureus is a ubiquitous and opportunistic bacteria associated with high mortality rates. Antimicrobial photodynamic therapy (aPDT) is based on the application of a light source and a photosensitizer that can interact with molecular oxygen, forming Reactive Oxygen Species (ROS) that result in bacterial inactivation. This study aimed to analyze, in vitro, the action of aPDT with Photodithazine® (PDZ) in methicillin-sensitive Staphylococcus aureus (MSSA) and methicillin-resistant Staphylococcus aureus (MRSA) strains. The strains were incubated with PDZ at 25, 50, 75, and 100 mg/L for 15 min and irradiated with fluences of 25, 50, and 100 J/cm2. The internalization of PDZ was evaluated by confocal microscopy, the bacterial growth by counting the number of colony-forming units, as well as the bacterial metabolic activity post-aPDT and the production of ROS. In both strains, the photosensitizer was internalized; the production of ROS increased when the aPDT was applied; there was a bacterial reduction compared to the control at all the evaluated fluences and concentrations; and, in most parameters, it was obtained complete inactivation with significant difference (p < 0.05). The implementation of aPDT with PDZ in clinical strains of S. aureus has resulted in its complete inactivation, including the MRSA strains.
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Affiliation(s)
- Beatriz Müller Nunes Souza
- Laboratory of Photobiology Applied to Health, Research and Development Institute, University of Vale do Paraíba, Urbanova 2911, Brazil; (B.M.N.S.); (J.G.P.); (A.H.C.P.)
| | - Juliana Guerra Pinto
- Laboratory of Photobiology Applied to Health, Research and Development Institute, University of Vale do Paraíba, Urbanova 2911, Brazil; (B.M.N.S.); (J.G.P.); (A.H.C.P.)
| | - André Henrique Correia Pereira
- Laboratory of Photobiology Applied to Health, Research and Development Institute, University of Vale do Paraíba, Urbanova 2911, Brazil; (B.M.N.S.); (J.G.P.); (A.H.C.P.)
| | - Alejandro Guillermo Miñán
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata 1900, Argentina;
| | - Juliana Ferreira-Strixino
- Laboratory of Photobiology Applied to Health, Research and Development Institute, University of Vale do Paraíba, Urbanova 2911, Brazil; (B.M.N.S.); (J.G.P.); (A.H.C.P.)
- Correspondence:
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Absence of methicillin-resistant Staphylococcus aureus colonization among immunocompetent healthy adults: Insights from a longitudinal study. PLoS One 2021; 16:e0253739. [PMID: 34191834 PMCID: PMC8244897 DOI: 10.1371/journal.pone.0253739] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 06/12/2021] [Indexed: 11/29/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) has long been known as a major cause of hospital-acquired (HA-MRSA) infections worldwide. For the past twenty years, an increasing number of studies have described its emergence in the community as well. In Portugal, a country with a high-prevalence of HA-MRSA, there are only limited data available on the epidemiology of MRSA in the community. We studied the prevalence of S. aureus and MRSA colonization among healthy adults in Portugal. Between February 2015 and December 2016, a longitudinal study was conducted in which 87 adults aged 25–50 years old were followed for six months. For each participant nasopharyngeal, oropharyngeal and saliva samples were obtained monthly and, in some cases, weekly. A total of 1,578 samples (n = 526 for each sampling site) were examined for the presence of S. aureus and MRSA by classical culture-based methods. Fifty-seven adults (65.5%) carried S. aureus at least once during the six months period of the study: 19.5% were persistent S. aureus carriers and 46.0% were intermittent carriers. Carriage rates per sampling site were 20.5% in nasopharynx, 18.3% in oropharynx, and 13.5% in saliva. Simultaneous screening of the three sampling sites increased detection of S. aureus, which overall occurred in 34.4% of the 526 sampling time-points. No MRSA were isolated. In conclusion, this study adds novel information about the MRSA scenario in the Portuguese community. Our results indicate that, in Portugal, MRSA does not seem to circulate among healthy adults without risk factors and therefore this age group does not constitute, at the current time, a reservoir of MRSA in the community.
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Temporal and spatial dynamics in the apple flower microbiome in the presence of the phytopathogen Erwinia amylovora. ISME JOURNAL 2020; 15:318-329. [PMID: 33024293 DOI: 10.1038/s41396-020-00784-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 09/09/2020] [Accepted: 09/17/2020] [Indexed: 02/04/2023]
Abstract
Plant microbiomes have important roles in plant health and productivity. However, despite flowers being directly linked to reproductive outcomes, little is known about the microbiomes of flowers and their potential interaction with pathogen infection. Here, we investigated the temporal spatial dynamics of the apple stigma microbiome when challenged with a phytopathogen Erwinia amylovora, the causal agent of fire blight disease. We profiled the microbiome from the stigmas of individual flowers, greatly increasing the resolution at which we can characterize shifts in the composition of the microbiome. Individual flowers harbored unique microbiomes at the operational taxonomic unit level. However, taxonomic analysis of community succession showed a population gradually dominated by bacteria within the families Enterobacteriaceae and Pseudomonadaceae. Flowers inoculated with E. amylovora established large populations of the phytopathogen, with pathogen-specific gene counts of >3.0 × 107 in 90% of the flowers. Yet, only 42% of inoculated flowers later developed fire blight symptoms. This reveals that pathogen abundance on the stigma is not sufficient to predict disease outcome. Our data demonstrate that apple flowers represent an excellent model in which to characterize how plant microbiomes establish, develop, and correlate with biological processes such as disease progression in an experimentally tractable plant organ.
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O. Luiz FBD, Alves KB, Barros RR. Prevalence and long-term persistence of beta-haemolytic streptococci throat carriage among children and young adults. J Med Microbiol 2019; 68:1526-1533. [DOI: 10.1099/jmm.0.001054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Fernanda Baptista de O. Luiz
- Departamento Microbiologia e Parasitologia, Instituto Biomédico, Universidade Federal Fluminense, Rua Professor Ernani de Melo 101, Niterói, RJ, 24210-130, Brazil
| | - Karen B. Alves
- Departamento Microbiologia e Parasitologia, Instituto Biomédico, Universidade Federal Fluminense, Rua Professor Ernani de Melo 101, Niterói, RJ, 24210-130, Brazil
| | - Rosana R. Barros
- Departamento Microbiologia e Parasitologia, Instituto Biomédico, Universidade Federal Fluminense, Rua Professor Ernani de Melo 101, Niterói, RJ, 24210-130, Brazil
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Chmagh AA, Abd Al-Abbas MJ. PCR-RFLP by AluI for coa gene of methicillin-resistant Staphylococcus aureus (MRSA) isolated from burn wounds, pneumonia and otitis media. GENE REPORTS 2019. [DOI: 10.1016/j.genrep.2019.100390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Pereira-Franchi EPL, Barreira MRN, da Costa NDSLM, Riboli DFM, Abraão LM, Martins KB, Victória C, Cunha MDLRDSD. Molecular epidemiology of methicillin-resistant Staphylococcus aureus in the Brazilian primary health care system. Trop Med Int Health 2019; 24:339-347. [PMID: 30549385 DOI: 10.1111/tmi.13192] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE To evaluate the molecular epidemiology and to georeference Staphylococcus aureus isolated from wounds and nares of patients seen at Basic Health Units (BHUs) of a Brazilian city. METHODS Observational, cross-sectional study conducted from 2010 to 2013. A total of 119 S. aureus strains isolated from the wounds and nares of 88 patients were studied. The isolates were characterised by identifying virulence genes encoding enterotoxins A-E, haemolysins α, β and δ, exfoliatins A, B and D, biofilm production, Panton-Valentine Leukocidin and toxic shock syndrome toxin 1, and by pulsed-field gel electrophoresis (PFGE), multilocus sequence and spa typing. RESULTS Eighteen methicillin-resistant Staphylococcus aureus (MRSA) (6 SCCmec type II and 12 SCCmec type IV) and 101 (85%) MSSA were identified. PFGE typing resulted in the formation of eight clusters, with STs 1, 5, 8, 30, 188, 1176 and 1635 and spa type t002 being the predominant types among MSSA. The 18 MRSA belonged to STs 5, 8 and 1176 and spa types t002 and t062. CONCLUSION The results demonstrate widespread dissemination of MSSA and MRSA clones carrying haemolysin, biofilm and toxin genes. Kernel density estimation revealed the highest density of S. aureus in the 4, 5 and 8 BHUs.
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Affiliation(s)
- Eliane Patricia Lino Pereira-Franchi
- Departamento de Microbiologia e Imunologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil
| | - Maria Rachel Nogueira Barreira
- Departamento de Microbiologia e Imunologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil
| | - Natália de Sousa Lima Moreira da Costa
- Departamento de Microbiologia e Imunologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil
| | - Danilo Flávio Moraes Riboli
- Departamento de Microbiologia e Imunologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil
| | - Ligia Maria Abraão
- Departamento de Microbiologia e Imunologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil.,Departamento de Doenças Tropicais, Faculdade de Medicina de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil
| | - Katheryne Benini Martins
- Departamento de Microbiologia e Imunologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil
| | - Cassiano Victória
- Departamento de Higiene Veterinária e Saúde Pública, Faculdade de Medicina Veterinaria e Zootecnia, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, Brazil
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