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Khan JA, Rathore RS, Ahmad I, Gill R, Husain FM, Arshad M, Alam P, Albalawi T, Al-Kheraif A, Akhtar J, Albarakaty FM, Neyaz LA, Elbanna K, Abulreesh HH. Assessment of Foodborne Bacterial Pathogens in Buffalo Raw Milk Using Polymerase Chain Reaction Based Assay. Foodborne Pathog Dis 2022; 19:750-757. [PMID: 36301255 DOI: 10.1089/fpd.2022.0044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Milk is a putrescible commodity that is extremely prone to microbial contamination. Primarily, milk and dairy products are believed to be easily contaminated by pathogenic microorganisms, including Listeria monocytogenes, Salmonella spp., and Staphylococcus aureus. The microbiological quality of raw milk and dairy products regarding foodborne pathogens is of paramount importance due to concern of human health. In this study 400 buffalo raw milk samples were screened for assessing the prevalence of L. monocytogenes, Salmonella spp., and S. aureus. This study implemented uniplex-polymerase chain reaction (u-PCR) and multiplex-polymerase chain reaction (m-PCR) assays for the fast simultaneous detection of these pathogens comparing to the conventional culturing methods. Raw milk samples were found contaminated with the prevalence of 2.2%, 4.0%, and 14.2% for L. monocytogenes, Salmonella spp., and S. aureus, respectively. These pathogens were detected with the optimized polymerase chain reaction assays after 6 h of enrichment. u-PCR and m-PCR demonstrated the limit of detection as 104, 102, and 10 cells/mL after 6, 12, 18, and 24 h for each culture of the pathogens. A high sensitivity (10 colony-forming unit [CFU]/mL) of the m-PCR protocol was noted. The developed protocol is a cost-effective and rapid method for the simultaneous detection of pathogens associated with raw milk and dairy industries.
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Affiliation(s)
- Javed Ahamad Khan
- Department of Natural Resource Management, Bedele Campus of Agriculture and Forestry, Mettu University, Bedele, Ethiopia
| | - Ram Swaroop Rathore
- Division of Veterinary Public Health, Indian Veterinary Research Institute, Bareilly, India
| | - Iqbal Ahmad
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh, India
| | - Rubina Gill
- Department of Agronomy, School of Agriculture, Lovely Professional University, Phagwara, India
| | - Fohad Mabood Husain
- Department of Food Science and Nutrition, King Saud University, Riyadh, Saudi Arabia
| | - Mohammed Arshad
- Dental Biomaterials Research Chair, Dental Health Department, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Pravej Alam
- Department of Biology, College of Science and Humanities, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Thamer Albalawi
- Department of Biology, College of Science and Humanities, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Abdulaziz Al-Kheraif
- Dental Biomaterials Research Chair, Dental Health Department, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Javeed Akhtar
- Department of Chemical Engineering, Adigrat University, Adigrat, Ethiopia
| | - Fawziah M Albarakaty
- Department of Biology, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Leena A Neyaz
- Department of Biology, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Khaled Elbanna
- Department of Biology, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia.,Department of Agricultural Microbiology, Faculty of Agriculture, Fayoum University, Fayoum, Egypt
| | - Hussein H Abulreesh
- Department of Biology, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
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Quraishi A, Kaur P, Singh Sharma N, Arora AK. Antibiotic sensitivity patterns in Staphylococcus spp. isolated from goat milk in association with molecular detection of antibiotic resistance genes. IRANIAN JOURNAL OF VETERINARY RESEARCH 2021; 22:239-243. [PMID: 34777526 DOI: 10.22099/ijvr.2021.38465.5599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 05/28/2021] [Accepted: 06/25/2021] [Indexed: 09/30/2022]
Abstract
Background Microbes become unresponsive to the drugs used to treat infections due to their ability to acquire antimicrobial resistance. Aims The present research aimed to study the patterns of phenotypic and genotypic antimicrobial resistance in Staphylococcus spp. isolated from goat milk. Methods A total of 200 milk samples were collected to isolate Staphylococcus spp. from mastitic and healthy goats from Punjab state, India. The isolates were then identified biochemically and molecularly (polymerase chain reaction (PCR)). An antibiotic sensitivity test was conducted using 15 different antibiotics. Molecular detection of antibiotic resistance genes was done using PCR. Chi-square test was done to study the association between genotypic and phenotypic resistance patterns among the isolates. Results A total of 47 Staphylococcus spp. were isolated of which 33 and 14 isolates were respectively coagulase positive and negative. The isolates phenotypically showed the highest resistance to Penicillin G (P) (91.4%). Methicillin resistant Staphylococcus aureus (MRSA) was found 56.25%. Amongst the antibiotic resistance genes, tetK (87.23%) was the most prevalent isolated gene followed by blaZ (85.10%), mecA (48.93%), and tetM (14.89%). Statistical analysis revealed that the genotypic and phenotypic resistance patterns were significantly associated with penicillin and methicillin (MET) resistances. Conclusion The high prevalence of antibiotic-resistant Staphylococcus spp., especially MRSA, in goat milk is of concern and needs to be addressed in this area.
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Affiliation(s)
- A Quraishi
- MVSc Student in Veterinary Microbiology, Department of Veterinary Microbiology, College of Veterinary Sciences, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141004, Punjab, India
| | - P Kaur
- Department of Veterinary Microbiology, College of Veterinary Sciences, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141004, Punjab, India
| | - N Singh Sharma
- Department of Veterinary Microbiology, College of Veterinary Sciences, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141004, Punjab, India
| | - A K Arora
- Department of Veterinary Microbiology, College of Veterinary Sciences, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141004, Punjab, India
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Ma X, wang C, Qin M, Tian X, Fan S, Zu H, Lyu M, Wang S. Rapid detection of Aeromonas hydrophila with a DNAzyme-based sensor. Food Control 2021. [DOI: 10.1016/j.foodcont.2020.107829] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Kim KT, Lee SH, Lee KK, Han JE, Kwak D. Enhanced Virulence of Aeromonas hydrophila Is Induced by Stress and Serial Passaging in Mice. Animals (Basel) 2021; 11:ani11020508. [PMID: 33669173 PMCID: PMC7919638 DOI: 10.3390/ani11020508] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/10/2021] [Accepted: 02/13/2021] [Indexed: 11/17/2022] Open
Abstract
Simple Summary Aeromonas hydrophila, which is an opportunistic zoonotic bacterium, has the ability to infect animals with injuries involving the condition of the aquatic environments. Factors including poor sanitation and water quality, stress, overcrowding, and rough handling can make animals more sensitive to infections and trigger outbreaks of A. hydrophila. A. hydrophila was previously isolated from an African black-footed penguin that died while in captivity at a zoo, following clinical signs of depression and anorexia, and in this study, we investigated the effect of stress and serial passaging in mice on A. hydrophila virulence. Serial passaging in mice enhanced the virulence of A. hydrophila, and A. hydrophila infection combined with administration of stress hormones or fasting increased mortality. Abstract Aeromonas hydrophila was isolated from an African black-footed penguin (Spheniscus demersus) that died while in zoo captivity. At necropsy, the virulence of A. hydrophila appeared to be enhanced by stress, so was assessed in the presence of in vitro and in vivo stressors and serial passaging in mice. Virulence genes from the isolate were amplified by PCR. In vitro assays were conducted to test the hemolytic activity, cytotoxicity, and effect of stress hormones on A. hydrophila virulence. In vivo assays were conducted to test the stress effect on mortality of A. hydrophila-infected mice and virulence in mice. Two virulence genes coding for hemolysin (ahh1) and aerolysin (aerA) were detected, and the cytotoxic potential of the isolate was demonstrated in baby hamster kidney and Vero cells. Some or all mice inoculated with A. hydrophila and exposed to stress hormones (epinephrine and norepinephrine) or low temperature died, while mice inoculated with A. hydrophila and exposed to fasting or agitation stressors or no stressors survived. We concluded that stress can be fatal in mice experimentally infected with A. hydrophila and that serial passaging in mice dramatically enhances the virulence of A. hydrophila.
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Affiliation(s)
- Kyoo-Tae Kim
- Animal Health Center of Zoo Land, Daejeon O-World Theme Park, Daejeon 35073, Korea;
| | - Seung-Hun Lee
- College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Korea;
| | - Kyoung-Ki Lee
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea;
| | - Jee Eun Han
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea;
| | - Dongmi Kwak
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea;
- Cardiovascular Research Institute, Kyungpook National University, Daegu 41944, Korea
- Correspondence: ; Tel.: +82-53-950-7794
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Siddaramappa S, Pullela K, Thimmappa B, Devkota R, Bajaj R, Manivannan B, Mahalingam N, Pradeep BE. Characterization of bla CTX-M sequences of Indian origin and thirteen uropathogenic Escherichia coli isolates resistant to multiple antibiotics. BMC Res Notes 2018; 11:630. [PMID: 30170618 PMCID: PMC6119312 DOI: 10.1186/s13104-018-3735-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 08/25/2018] [Indexed: 11/10/2022] Open
Abstract
Objectives ESBL-producing isolates of the Enterobacteriaceae occur throughout the world. The objectives of this study were to characterize uropathogenic Escherichia coli isolated at a tertiary care hospital in southern India, and shed light on blaCTX-M sequences of Indian origin. Results A cohort of 13 urinary isolates of E. coli (obtained from patients at the Sri Sathya Sai Institute of Higher Medical Sciences, Prasanthigram, Andhra Pradesh, India) were characterized and found to be resistant to multiple antibiotics, including extended-spectrum cephalosporins. All 13 isolates contained blaCTX-M-15, and many of them transferred this genotype to at least one laboratory strain of E. coli after conjugation. Analyses of blaCTX-M-15 sequences (n = 141) of Indian origin showed that > 85% of them were obtained from bacteria not associated with the urinary tract, and that E. coli isolates account for majority of all blaCTX-M-15-carrying bacteria reported from India. Other types of blaCTX-M appear to be rare in India, since only six such sequences were reported as of July 2015. The results indicate that ‘selection pressure’ exerted by extended-spectrum cephalosporins may have stabilized the blaCTX-M-15 genotype among E. coli in India. The rarity of other blaCTX-M suggests that they lack the survival advantage that blaCTX-M-15 may have. Electronic supplementary material The online version of this article (10.1186/s13104-018-3735-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Shivakumara Siddaramappa
- Institute of Bioinformatics and Applied Biotechnology, Biotech Park, Electronic City, Bengaluru, Karnataka, India
| | - Karthik Pullela
- Sri Sathya Sai Institute of Higher Learning, Vidyagiri, Prasanthi Nilayam, Andhra Pradesh, India
| | - Bhagya Thimmappa
- Institute of Bioinformatics and Applied Biotechnology, Biotech Park, Electronic City, Bengaluru, Karnataka, India
| | - Ranjan Devkota
- Sri Sathya Sai Institute of Higher Learning, Vidyagiri, Prasanthi Nilayam, Andhra Pradesh, India
| | - Rani Bajaj
- Institute of Bioinformatics and Applied Biotechnology, Biotech Park, Electronic City, Bengaluru, Karnataka, India
| | - Bhavani Manivannan
- Sri Sathya Sai Institute of Higher Learning, Vidyagiri, Prasanthi Nilayam, Andhra Pradesh, India.,Sri Sathya Sai Institute of Higher Medical Sciences, Prasanthigram, Andhra Pradesh, India
| | - Niranjana Mahalingam
- Sri Sathya Sai Institute of Higher Learning, Vidyagiri, Prasanthi Nilayam, Andhra Pradesh, India.,Sri Sathya Sai Institute of Higher Medical Sciences, Prasanthigram, Andhra Pradesh, India
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Latif-Eugenín F, Beaz-Hidalgo R, María José F. A Culture Independent Method for the Detection of Aeromonas sp. from Water Samples. Ital J Food Saf 2016; 5:5489. [PMID: 27800428 PMCID: PMC5076704 DOI: 10.4081/ijfs.2016.5489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 09/27/2015] [Accepted: 09/28/2015] [Indexed: 01/09/2023] Open
Abstract
The genus Aeromonas is present in a wide variety of water environments and is recognised as potentially pathogenic to humans and animals. Members of this genus are often confused with Vibrio when using automated, commercial identification systems that are culture-dependent. This study describes a polymerase chain reaction (PCR) detection method for Aeromonas that is culture-independent and that targets the glycerophospholopid-cholesterol acyltransferase (gcat) gene, which is specific for this genus. The GCAT-PCR was 100% specific in artificially inoculated water samples, with a detection limit that ranged from 2.5 to 25 cfu/mL. The success at detecting this pathogen in 86 water samples using the GCAT-PCR method was identical to the conventional culturing method when a pre-enrichment step was carried out, yielding 83.7% positive samples. On the other hand, without a pre-enrichment step, only 77.9% of the samples were positive by culturing and only 15.1% with the GCAT-PCR. However, 83.7% positive samples were obtained for the GCAT-PCR when the water volume for the DNA extraction was increased from 400 µL to 4 mL. The proposed molecular method is much faster (5 or 29 h) than the culturing method (24 or 48 h) whether performed directly or after a pre-enrichment step and it will enable the fast detection of Aeromonas in water samples helping to prevent a possible transmission to humans.
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Affiliation(s)
- Fadua Latif-Eugenín
- Unit of Microbiology, Medicine and Health Science School, Rovira i Virgili University , Reus, Spain
| | - Roxana Beaz-Hidalgo
- Unit of Microbiology, Medicine and Health Science School, Rovira i Virgili University , Reus, Spain
| | - Figueras María José
- Unit of Microbiology, Medicine and Health Science School, Rovira i Virgili University , Reus, Spain
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7
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Wang Y, Salazar JK. Culture-Independent Rapid Detection Methods for Bacterial Pathogens and Toxins in Food Matrices. Compr Rev Food Sci Food Saf 2015; 15:183-205. [DOI: 10.1111/1541-4337.12175] [Citation(s) in RCA: 161] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 09/14/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Yun Wang
- Div. of Food Processing Science and Technology; U.S. Food and Drug Administration; Bedford Park IL U.S.A
| | - Joelle K. Salazar
- Div. of Food Processing Science and Technology; U.S. Food and Drug Administration; Bedford Park IL U.S.A
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8
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Detection of Aeromonas hydrophila DNA oligonucleotide sequence using a biosensor design based on Ceria nanoparticles decorated reduced graphene oxide and Fast Fourier transform square wave voltammetry. Anal Chim Acta 2015; 895:80-8. [DOI: 10.1016/j.aca.2015.05.055] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 05/26/2015] [Accepted: 05/30/2015] [Indexed: 11/20/2022]
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9
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Didugu H, Thirtham M, Nelapati K, Reddy KK, Kumbhar BS, Poluru A, Pothanaboyina G. A study on the prevalence of Aeromonas spp. and its enterotoxin genes in samples of well water, tap water, and bottled water. Vet World 2015; 8:1237-42. [PMID: 27047024 PMCID: PMC4774662 DOI: 10.14202/vetworld.2015.1237-1242] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 09/11/2015] [Accepted: 09/18/2015] [Indexed: 11/30/2022] Open
Abstract
AIM The aim of this work was to study the prevalence of Aeromonas spp. and its enterotoxin genes in various water sources. MATERIALS AND METHODS 125 samples (50 from well water, 50 from tap water, and 25 from bottled water) were collected from various sources in and around Greater Hyderabad Municipal Corporation and examined for the presence of aeromonads by both cultural and polymerase chain reaction (PCR) assay. Alkaline peptone water with ampicillin was used as enrichment. Aeromonas isolation medium and ampicillin dextrin agar were used as selective media. The boiling and snap chilling method was used for DNA extraction. Primers targeted against 16S rRNA, aer, and ast were used to identify aeromonads and its enterotoxins. RESULTS 48%, 18%, and 12% of well water, tap water, and bottled water samples were found positive by cultural assay with an overall prevalence of 28.8%. Aeromonads were detected in 32 % (52% in well water, 20% in tap water, and 16% in bottled water) of samples by PCR assay. Aerolysin (aer) gene was noticed in 34.6%, 20%, and 0% of well water, tap water, and bottled water samples, respectively, with an overall prevalence of 27.5%. Thermostable cytotonic enterotoxin (ast) was observed in 37.5% (42.3% in well water, 30% in tap water, and 25% in bottled mineral water) of samples. CONCLUSIONS Presence of aeromonads and its toxin genes in various sources of water is of public health concern and emphasizes the need for necessary preventive measures to tackle the problem.
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Affiliation(s)
- Hareesh Didugu
- Animal Disease Diagnostic Laboratory, Vijayawada, Andhra Pradesh, India
| | - Madhavarao Thirtham
- Department of Veterinary Public Health and Epidemiology, College of Veterinary Science, Proddatur, Andhra Pradesh, India
| | - Krishnaiah Nelapati
- Department of Veterinary Public Health, College of Veterinary Science, Rajendranagar, Telangana, India
| | - K Kondal Reddy
- Department of Livestock Products Technology, Sri P.V. Narsimha Rao Telangana State University for Veterinary, Animal and Fishery Sciences, Rajendranagar, Telangana, India
| | - Baba Saheb Kumbhar
- Department of Veterinary Public Health, College of Veterinary Science, Rajendranagar, Telangana, India
| | - Anusha Poluru
- Department of Veterinary Public Health, College of Veterinary Science, Rajendranagar, Telangana, India
| | - Guruvishnu Pothanaboyina
- Department of Animal Genetics and Breeding, College of Veterinary Science, Proddatur, Andhra Pradesh, India
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10
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Gowda TKGM, Reddy VRAP, Devleesschauwer B, Zade NN, Chaudhari SP, Khan WA, Shinde SV, Patil AR. Isolation and Seroprevalence of Aeromonas spp. Among Common Food Animals Slaughtered in Nagpur, Central India. Foodborne Pathog Dis 2015; 12:626-30. [PMID: 25946095 DOI: 10.1089/fpd.2014.1922] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Aeromonads are ubiquitous foodborne pathogens with a global distribution. Animal-origin foods and contaminated animals are the main sources of Aeromonas infection to humans. So far little is known about the occurrence of Aeromonas spp. in food-producing animals in India. The present study was conducted to determine the prevalence and seroprevalence of Aeromonas species from 50 each of meat, blood, and sera samples collected from cattle, buffaloes, goats, and pigs slaughtered in and around Nagpur, Central India. Alkaline peptone water and ampicillin dextrin agar were used to isolate Aeromonas spp. An indirect enzyme-linked immunosorbent assay (ELISA) was standardized by use of whole-cell antigen (WC) and outer membrane protein (OMP) of Aeromonas hydrophila (MTCC 646). Aeromonads were isolated from 44 (22%) of the meat samples, and 1 (0.5%) from the blood samples. Seroprevalence by indirect ELISA-based WC antigen was estimated as 68% in cattle, 44% in buffaloes, 60% in goats, and 30% in pigs. OMP-based ELISA yielded a seroprevalence of 56%, 48%, 52%, and 22% in cattle, buffaloes, goats, and pigs, respectively. The results revealed that OMP-based ELISA and WC-based ELISA were in agreement with one another. Isolation along with high seropositivity demonstrates the presence of foodborne Aeromonas spp. in the Nagpur city of Central India.
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Affiliation(s)
- Tanuja K G M Gowda
- 1 Department of Veterinary Public Health, Nagpur Veterinary College, Maharashtra Animal and Fishery Science University , Seminary Hills, Nagpur (Maharashtra), India
| | - Vishwanatha R A P Reddy
- 2 Department of Biochemistry, Indian Veterinary Research Institute , Bareilly, Uttar Pradesh, India
| | - Brecht Devleesschauwer
- 3 Department of Virology, Parasitology, and Immunology, Faculty of Veterinary Medicine, Ghent University , Merelbeke, Belgium .,4 Institute of Health and Society (IRSS), Faculty of Public Health, Université Catholique de Louvain , Brussels, Belgium
| | - Nandkishor N Zade
- 1 Department of Veterinary Public Health, Nagpur Veterinary College, Maharashtra Animal and Fishery Science University , Seminary Hills, Nagpur (Maharashtra), India
| | - Sandeep P Chaudhari
- 1 Department of Veterinary Public Health, Nagpur Veterinary College, Maharashtra Animal and Fishery Science University , Seminary Hills, Nagpur (Maharashtra), India
| | - Waqar A Khan
- 1 Department of Veterinary Public Health, Nagpur Veterinary College, Maharashtra Animal and Fishery Science University , Seminary Hills, Nagpur (Maharashtra), India
| | - Shilpa V Shinde
- 1 Department of Veterinary Public Health, Nagpur Veterinary College, Maharashtra Animal and Fishery Science University , Seminary Hills, Nagpur (Maharashtra), India
| | - Archana R Patil
- 1 Department of Veterinary Public Health, Nagpur Veterinary College, Maharashtra Animal and Fishery Science University , Seminary Hills, Nagpur (Maharashtra), India
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11
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Igbinosa IH. Antibiogram profiling and pathogenic status of Aeromonas species recovered from Chicken. Saudi J Biol Sci 2014; 21:481-5. [PMID: 25313284 PMCID: PMC4190985 DOI: 10.1016/j.sjbs.2014.06.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2014] [Revised: 06/17/2014] [Accepted: 06/22/2014] [Indexed: 10/25/2022] Open
Abstract
Poultry meat and its products are widely consumed by humans globally, however, Aeromonas infections in poultry have been reported in different parts of the world with devastating effects. This study was carried out to assess the antibiogram and biofilm forming potential of Aeromonas isolated from chicken fecal samples. Aeromonas isolates were screened for antibiotic susceptibility using antibiotics disk and biofilm producing potentials on abiotic surfaces. Nineteen isolates recovered from chicken feces were 100% sensitive to ciprofloxacin, gentamicin and the tetracyclines. About 53% of Aeromonas isolates were resistant to erythromycin and 47% resistant to streptomycin. Eight isolates (42.1%) were found to be moderate producers of biofilm, 31.6% (6/19) were weak producers of biofilm, 10.5% (2/19) were non biofilm producers while 15.8% (3/19) were strong producers. The present investigation shows a prevalence of potentially pathogenic Aeromonas strains in chicken feces, suggesting potential group at risk for Aeromonas infection which could be dissemination to other animals or humans with close contact and the wider community.
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Affiliation(s)
- Isoken H. Igbinosa
- Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
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13
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Abstract
The availability of purified antibodies is prerequisite for many applications and the appropriate choice(s) of antibody-purification steps is crucial. Numerous methods have been developed for the purification of antibodies; however, affinity chromatography-based methods are the most extensively utilized. These methods are based on highly specific and reversible biological interactions between two molecules (e.g., between receptor and ligand or antibody and antigen). Affinity chromatography offers very high selectivity, involving minimal steps, providing simplicity of approach and rapidity. Implementing an effective protocol often requires meticulous planning and testing in order to achieve high purity and yields of desired antibody types/subtypes. This chapter describes the basic techniques for purification of monoclonal, polyclonal, and recombinant antibodies employing affinity chromatography.
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14
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Walsh HA, Pietersen G. Rapid detection of Grapevine leafroll-associated virus type 3 using a reverse transcription loop-mediated amplification method. J Virol Methods 2013; 194:308-16. [PMID: 24025344 DOI: 10.1016/j.jviromet.2013.08.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 08/21/2013] [Accepted: 08/27/2013] [Indexed: 10/26/2022]
Abstract
Grapevine leafroll disease (GLD) is the most important disease of Grapevines in South Africa. Grapevine leafroll-associated virus type 3 (GLRaV-3) has a close association with the disease and is prevalent in South African vineyards. GLD can be controlled using a combination of virus-free planting material, systemic insecticides to control vector populations and removal of infected vines by roguing. Infected vines are identified each autumn using either symptom display (in red cultivars) or ELISA (in white cultivars). While ELISA is a simple, reliable means of testing for GLRaV-3, it is time consuming, laborious and insensitive and a quicker, more sensitive method of detecting GLRaV-3 in the field is needed. A single-tube one-step reverse transcription (RT) loop-mediated isothermal amplification (LAMP) assay combined with a simple RNA extraction protocol was developed for the rapid and easy detection of GLRaV-3. Hydroxy napthol blue was included as an indicator and under isothermal conditions at 60 °C the target viral gene could be amplified in under 2h and positive results could be easily seen by examining the colour change from violet to sky blue. Using this method, 50 samples could be also pooled together with a single positive sample still being detected. A direct comparison of ELISA, nested PCR and RT-LAMP showed that RT-LAMP is as sensitive as nested PCR and could be performed in a much shorter time with less equipment. This assay is may be a possible alternative to ELISA for the detection of GLRaV-3 in the field.
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Affiliation(s)
- Helen Ann Walsh
- University of Pretoria, Department of Microbiology and Plant Pathology, Pretoria, South Africa.
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15
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Ayyar BV, Arora S, Murphy C, O'Kennedy R. Affinity chromatography as a tool for antibody purification. Methods 2011; 56:116-29. [PMID: 22033471 DOI: 10.1016/j.ymeth.2011.10.007] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 10/11/2011] [Accepted: 10/12/2011] [Indexed: 11/29/2022] Open
Abstract
The global antibody market has grown exponentially due to increasing applications in research, diagnostics and therapy. Antibodies are present in complex matrices (e.g. serum, milk, egg yolk, fermentation broth or plant-derived extracts). This has led to the need for development of novel platforms for purification of large quantities of antibody with defined clinical and performance requirements. However, the choice of method is strictly limited by the manufacturing cost and the quality of the end product required. Affinity chromatography is one of the most extensively used methods for antibody purification, due to its high selectivity and rapidity. Its effectiveness is largely based on the binding characteristics of the required antibody and the ligand used for antibody capture. The approaches used for antibody purification are critically examined with the aim of providing the reader with the principles and practical insights required to understand the intricacies of the procedures. Affinity support matrices and ligands for affinity chromatography are discussed, including their relevant underlying principles of use, their potential value and their performance in purifying different types of antibodies, along with a list of commercially available alternatives. Furthermore, the principal factors influencing purification procedures at various stages are highlighted. Practical considerations for development and/or optimizations of efficient antibody-purification protocols are suggested.
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Affiliation(s)
- B Vijayalakshmi Ayyar
- Biomedical Diagnostics Institute, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland
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Nagar V, Shashidhar R, Bandekar JR. Prevalence, Characterization, and Antimicrobial Resistance of Aeromonas Strains from Various Retail Food Products in Mumbai, India. J Food Sci 2011; 76:M486-92. [DOI: 10.1111/j.1750-3841.2011.02303.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Heidenreich B, Pöhlmann C, Sprinzl M, Gareis M. Detection of Escherichia coli in meat with an electrochemical biochip. J Food Prot 2010; 73:2025-33. [PMID: 21219714 DOI: 10.4315/0362-028x-73.11.2025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Detection of foodborne pathogenic and spoilage bacteria by RNA-DNA hybridization is an alternative to traditional microbiological procedures. To achieve high sensitivity with RNA-DNA-based methods, efficient bacterial lysis and release of nucleic acids from bacteria are needed. Here we report the specific detection of the hygiene indicator microorganism Escherichia coli in meat by use of electrochemical biochips. We improved RNA isolation from bacteria in meat juice from pork and beef. Samples, either naturally or artificially contaminated by E. coli, were enriched by incubation in full or minimal medium. A combined treatment of the samples with lysozyme, proteinase K, and sonication resulted in efficient cell disruption and high total RNA yields. Together with optimization of enrichment time, this ensures high sensitivity of electrochemical measurements on biochips. A short enrichment period and the triple-lysis regimen in combination with electrochemical biochip measurement were tested with 25 meat samples. The lower limit of detection of the biochip was approximately 2,000 CFU of E. coli per ml. The entire analysis procedure (5 h of enrichment, triple lysis, and biochip detection) has a lower limit of detection of 1 CFU of E. coli per ml within a total time needed for analysis of 7 h.
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Affiliation(s)
- Bernd Heidenreich
- Max Rubner-Institute, Institute of Microbiology and Biotechnology, Kulmbach, Germany
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Tichoniuk M, Gwiazdowska D, Ligaj M, Filipiak M. Electrochemical detection of foodborne pathogen Aeromonas hydrophila by DNA hybridization biosensor. Biosens Bioelectron 2010; 26:1618-23. [PMID: 20829023 DOI: 10.1016/j.bios.2010.08.030] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 07/17/2010] [Accepted: 08/12/2010] [Indexed: 12/01/2022]
Abstract
The paper describes an electrochemical DNA biosensor used for the detection of Aeromonas hydrophila. This opportunistic pathogen is recognized as an emerging foodborne hazard and is associated with a variety of virulence factors including production of cytotoxic enterotoxin aerolysin. The genosensor recognition layer was prepared using mixed self-assembled monolayer (SAM) consisting of thiolated single-stranded DNA probe (ssDNA) and diluent molecules--mercaptoalcohol: mercaptoethanol (MCE) or mercaptohexanol (MCH) or mercaptononanol (MCN). The voltammetric examination of double-layer capacitance of biosensor recognition interface supported by chronocoulometric quantitation of DNA present on the electrode surface showed that mixed ssDNA and MCH monolayer revealed the lowest defectiveness. Its double-layer capacitance equaled 4.0 μF cm(-2) and ssDNA probe surface coverage reached 8.5×10(11) molecules cm(-2) of gold electrode surface. Chronocoulometric quantitation of DNA and square wave voltammetry (SWV) measurements of electroactive indicator, methylene blue (MB) were performed to investigate the influence of hybridization reaction time, concentration of target DNA fragments, and presence of non-complementary DNA on the electrochemical response of genosensor recognition interface. The biosensor enabled distinction between the DNA samples isolated from A. hydrophila (present at the concentration of 2.5 μg cm(-3)) and other microbial DNA.
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Affiliation(s)
- M Tichoniuk
- Poznan University of Economics, Al. Niepodleglosci 10, 61-875 Poznan, Poland.
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Detection of toxigenic strains of Aeromonas species in foods by a multiplex PCR assay. Indian J Microbiol 2010; 50:139-44. [PMID: 23100820 DOI: 10.1007/s12088-010-0038-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Accepted: 10/14/2008] [Indexed: 10/19/2022] Open
Abstract
Aeromonas hydrophila and other aeromonads are ubiquitous organisms found in meat, vegetables, drinking water and various other food items. They cause diarrhea and extra-intestinal infections in normal and immunocompromised patients. The aim of the study was to develop a multiplex PCR assay for the detection of virulence-associated genes of Aeromonas including hemolysin (hlyA), aerolysin (aerA), glycerophospholipid-cholesterol acyl transferase (GCAT) alongwith a 16S rRNA gene. Internal amplification control (IAC), which was coamplified with aerA primers, was also included in this study. The results showed that all cultures of Aeromonas were accurately identified by the assay without showing non-specificity. A. hydrophila could be detected at a range of 10-50 CFU ml(-1) from experimentally spiked fish, chicken and milk samples following overnight enrichment in alkaline peptone water supplemented with 10 μg/ml ampicillin (APW-A) by this multiplex PCR (mPCR). When evaluated on a total of 74 naturally occurring food samples, four samples were identified to contain Aeromonas by mPCR. All these results were compared to the conventional culture, isolation and biochemical identification procedures. The high throughput and cost-effective mPCR method developed in this study could provide a powerful tool for detection of pathogenic Aeromonas spp. from food and environmental samples and in addition, the method has advantages in terms of specificity, sensitivity and ease of use compared to other reported PCR methods and DNA hybridization assays.
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An overview of foodborne pathogen detection: In the perspective of biosensors. Biotechnol Adv 2010; 28:232-54. [DOI: 10.1016/j.biotechadv.2009.12.004] [Citation(s) in RCA: 805] [Impact Index Per Article: 57.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2008] [Revised: 12/03/2009] [Accepted: 12/04/2009] [Indexed: 12/12/2022]
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Mastitis detection: current trends and future perspectives. Trends Biotechnol 2009; 27:486-93. [PMID: 19616330 DOI: 10.1016/j.tibtech.2009.05.004] [Citation(s) in RCA: 265] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Revised: 05/08/2009] [Accepted: 05/18/2009] [Indexed: 01/31/2023]
Abstract
Bovine mastitis, the most significant disease of dairy herds, has huge effects on farm economics due to reduction in milk production and treatment costs. Traditionally, methods of detection have included estimation of somatic cell counts, an indication of inflammation, measurement of biomarkers associated with the onset of the disease (e.g. the enzymes N-acetyl-beta-D-glucosaminidase and lactate dehydrogenase) and identification of the causative microorganisms, which often involves culturing methods. These methods have their limitations and there is a need for new rapid, sensitive and reliable assays. Recently, significant advances in the identification of nucleic acid markers and other novel biomarkers and the development of sensor-based platforms have taken place. These novel strategies have shown promise, and their advantages over the conventional tests are discussed.
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Prevalence of different outer membrane proteins in isolates of Aeromonas species. World J Microbiol Biotechnol 2008. [DOI: 10.1007/s11274-008-9740-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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