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Polat İ, Şen B, Onurdağ FK. Salmonella enterica serotypes isolated for the first time in laying hens, and their susceptibility to antibiotics. Poult Sci 2024; 103:103180. [PMID: 37980729 PMCID: PMC10685019 DOI: 10.1016/j.psj.2023.103180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 09/20/2023] [Accepted: 10/06/2023] [Indexed: 11/21/2023] Open
Abstract
In this study, a total of 323 drag swab samples were taken from laying hen fresh feces from 3 different provinces (Kırklareli, Edirne, and Tekirdağ), which are located in the European part of Türkiye. According to the ISO 6579: 2002 method, 17.3% of the samples were found positive for Salmonella. Obtained 56 Salmonella isolates were serotyped by slide agglutination using antisera according to Kauffmann White Le Minor Scheme. Sixteen serotypes of Salmonella were identified as S. Typhimurium (28.6%), S. Kentucky (17.9%), S. Abony (16.1%), S. Infantis (8.9%), S. Enteritidis (5.4%), S. Anatum (3.6%), S. Saintpaul (3.6%), S. Szentes (1.8%), S. Dibra (1.8%), S. Fallowfield (1.8%), S. Kimuenza (1.8%), S. Escanaba (1.8%), S. Nagoya (1.8%), S. Mbandaka (1.8%), S. Agona (1.8%), and Salmonella II 17: e, n, x, z15: 1,6 (1.8%). Isolations of S. Kimuenza, S. Escanaba, and S. Nagoya from laying hens are reported for the first time in Türkiye. The isolations of S. Dibra, S. Fallowfield, S. Szentes, and Salmonella II 17: e, n, x, z15: 1,6 from laying hens are the first report in the world. A total of 56 Salmonella isolates were tested for susceptibility to amoxicillin-clavulanic acid, cefepime, azithromycin, cefoxitin, and trimethoprim/sulfamethoxazole by the disk diffusion method. While 10% of S. Kentucky isolates were resistant to ofloxacin, and S. Kimuenza was only resistant to chloramphenicol.
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Affiliation(s)
- İbrahim Polat
- Department of Biology, Institute of Natural and Applied Sciences, Trakya University, 22030 Edirne, Türkiye.
| | - Burhan Şen
- Department of Biology, Faculty of Science, Trakya University, 22030 Edirne, Türkiye.
| | - Fatma Kaynak Onurdağ
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Trakya University, 22030 Edirne, Türkiye.
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2
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Kaur A, Ruhela A, Sharma P, Khariwal H, Seth S, Kumar A, Kapil A, Elangovan R, Kalyanasundaram D. Simultaneous and high sensitive detection of Salmonella typhi and Salmonella paratyphi a in human clinical blood samples using an affordable and portable device. Biomed Microdevices 2019; 21:95. [PMID: 31707575 DOI: 10.1007/s10544-019-0441-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Enteric fever is one of the leading causes of infection and subsequent fatality (greater than 1.8 million) (WHO 2018), especially in the developing countries due to contaminated water and food inter twinned with unhygienic practices. Clinical gold standard technique of culture-based method followed by biochemical tests demand 72+ hours for diagnosis while newly developed techniques (like PCR, RT-PCR, DNA microarray etc.) suffer from high limit of detection or involve high-cost infrastructure or both. In this work, a quick and highly specific method, SMOL was established for simultaneous detection of Salmonella paratyphi A and Salmonella typhi in clinical blood samples. SMOL consists of (i) pre-concentration of S. typhi and S. paratyphi A cells using magnetic nanoparticles followed by (ii) cell lysis and DNA extraction (iii) amplification of select nucleic acids by LAMP technique and (iv) detection of amplified nucleic acids using an affordable portable device (costs less than $70). To identify the viability of target cells at lower concentrations, the samples were processed at two different time periods of t = 0 and t = 4 h. Primers specific for the SPA2539 gene in S. paratyphi A and STY2879 gene in S. typhi were used for LAMP. Within 6 h SMOL was able to detect positive and negative samples from 55 human clinical blood culture samples and detect the viability of the cells. The results were concordant with culture and biochemical tests as well as by qPCR. Statistical power analysis yielded 100%. SMOL results were concordant with culture and biochemical tests as well as by qPCR. The sensitive and affordable system SMOL will be effective for poor resource settings.
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Affiliation(s)
- Avinash Kaur
- Centre for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Ankur Ruhela
- Centre for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Priyanka Sharma
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Harshit Khariwal
- Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Sagar Seth
- Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Adarsh Kumar
- Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Arti Kapil
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Ravikrishnan Elangovan
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Dinesh Kalyanasundaram
- Centre for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India. .,Department of Biomedical Engineering, All India Institute of Medical Sciences, New Delhi, 110029, India.
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3
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McAuley CM, McMillan K, Moore SC, Fegan N, Fox EM. Prevalence and characterization of foodborne pathogens from Australian dairy farm environments. J Dairy Sci 2014; 97:7402-12. [DOI: 10.3168/jds.2014-8735] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 08/31/2014] [Indexed: 01/13/2023]
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Amalia U, Dewanti-Hariyadi R, Poernomo A. RAPID DETECTION OF Salmonella IN SHRIMP BY POLYMERASE CHAIN REACTION. JURNAL TEKNOLOGI DAN INDUSTRI PANGAN 2014. [DOI: 10.6066/jtip.2014.25.1.78] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Pavan Kumar P, Agarwal RK, Thomas P, Sailo B, Prasannavadhana A, Kumar A, Kataria JL, Singh DK. Rapid Detection ofSalmonella entericaSubspeciesentericaserovar Typhimurium by Loop Mediated Isothermal Amplification (LAMP) Test From Field Chicken Meat Samples. FOOD BIOTECHNOL 2014. [DOI: 10.1080/08905436.2013.870911] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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6
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Almeida C, Cerqueira L, Azevedo NF, Vieira MJ. Detection of Salmonella enterica serovar Enteritidis using real time PCR, immunocapture assay, PNA FISH and standard culture methods in different types of food samples. Int J Food Microbiol 2012; 161:16-22. [PMID: 23246608 DOI: 10.1016/j.ijfoodmicro.2012.11.014] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Revised: 10/30/2012] [Accepted: 11/17/2012] [Indexed: 10/27/2022]
Abstract
Several methods for the rapid and specific detection of Salmonella in food samples have been described. Here, we compare 4 of those methods in terms of assay time, procedure complexity, detection limit, sensitivity, specificity and accuracy. Milk, eggs and mayonnaise samples were artificially contaminated with Salmonella enterica serovar Enteritidis cell concentrations ranging from 1×10(-2) to 1×10(2) CFU per 25 g or ml of food. Samples were then pre-enriched and analyzed by either: i) real-time PCR, using the iQ-Check Salmonella kit; ii) immunocapture, using the RapidChek SELECT Salmonella; iii) a peptide nucleic acid fluorescence in situ hybridization (PNA FISH) method and iv) the traditional bacteriological method ISO 6579:2002. All methods were able to detect Salmonella in the different types of food matrixes and presented a similar detection level of 1CFU per 25 g or ml of food sample. The immunocapture and the PNA FISH methods proved to be very reliable, as their results were 100% in agreement with the ISO method. However, real-time PCR presented a significant number of false positives, which resulted in a specificity of 55.6% (CI 95%, 31.3-77.6) and an accuracy of 82.2% (CI 95%, 63.2-91.4) for this method. Sensitivity was 100% since no false negative results were observed. In conclusion, the implementation of these molecular techniques, mainly the immunocapture and PNA-FISH methods, provides a reliable and less time-consuming alternative for the detection of Salmonella spp. in food samples.
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Affiliation(s)
- C Almeida
- IBB, Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar 4710-057, Braga, Portugal
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7
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Scientific Opinion on an estimation of the public health impact of setting a new target for the reduction ofSalmonellain turkeys. EFSA J 2012. [DOI: 10.2903/j.efsa.2012.2616] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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8
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Tang T, Cheng A, Wang M, Li X, He Q, Jia R, Zhu D, Chen X. Development and clinical verification of a loop-mediated isothermal amplification method for detection of Salmonella species in suspect infected ducks. Poult Sci 2012; 91:979-86. [DOI: 10.3382/ps.2011-01992] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Hu Q, Tu J, Han X, Zhu Y, Ding C, Yu S. Development of multiplex PCR assay for rapid detection of Riemerella anatipestifer, Escherichia coli, and Salmonella enterica simultaneously from ducks. J Microbiol Methods 2011; 87:64-9. [PMID: 21791228 DOI: 10.1016/j.mimet.2011.07.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 06/28/2011] [Accepted: 07/08/2011] [Indexed: 10/17/2022]
Abstract
Three pathogens, Riemerella anatipestifer, Escherichia coli, and Salmonella enterica, are leading causes of bacterial fibrinous pericarditis and perihepatitis in ducks in China and worldwide. It is difficult to differentiate these pathogens when obtaining a diagnosis on clinical signs and pathological changes. The aim of this research was to develop a multiplex polymerase chain reaction (m-PCR) that could discriminate R. anatipestifer, E. coli, and S. enterica rapidly in field isolates, or detect the three bacteria in clinical samples from diseased ducks. We selected the DnaB helicase (dnaB) gene of R. anatipestifer, alkaline phosphatase (phoA) gene of E. coli and invasion protein (invA) gene of S. enterica as target genes. In optimized conditions, the limitation of detection was approximately 10(3) colony forming units (CFU) of each of these three bacterial pathogens per PCR reaction tube. The m-PCR method showed specific amplification of respective genes from R. anatipestifer, E. coli, and S. enterica. Using the m-PCR system, bacterial strains isolated from diseased ducks in our laboratory were categorized successfully, and the pathogens could also be detected in clinical samples from diseased ducks. Therefore, the m-PCR system could distinguish the three pathogens simultaneously, for identification, routine molecular diagnosis and epidemiology, in a single reaction.
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Affiliation(s)
- Qinghai Hu
- Shanghai Veterinary Research Institute, the Chinese Academy of Agricultural Sciences (CAAS), 518 Ziyue Road, Shanghai 200241, PR China
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10
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Mainali C, McFall M, King R. Validation of a real-time polymerase chain reaction assay for the detection ofSalmonella in crops of broiler chickens. Poult Sci 2011; 90:660-4. [DOI: 10.3382/ps.2010-00634] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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11
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Eyigor A, Temelli S, Carli KT. Evaluation of ISO 6579 and FDA-BAM Methods to Complement Real-Time Polymerase Chain Reaction for the Detection of Salmonella in Naturally Contaminated Poultry Meat and Red Meat. Foodborne Pathog Dis 2010; 7:921-7. [DOI: 10.1089/fpd.2009.0497] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Aysegul Eyigor
- Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Uludag University, Bursa, Turkey
| | - Seran Temelli
- Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Uludag University, Bursa, Turkey
| | - Kamil Tayfun Carli
- Department of Microbiology, Faculty of Veterinary Medicine, Uludag University, Bursa, Turkey
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Temelli S, Kahya S, Eyigor A, Carli K. Incidence of Salmonella Enteritidis in chicken layer flocks in Turkey: Results by real-time polymerase chain reaction and International Organization for Standardization culture methods. Poult Sci 2010; 89:1406-10. [DOI: 10.3382/ps.2010-00796] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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13
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Polymerase Chain Reaction for the Rapid Detection and Serovar Identification of Salmonella in Food and Feeding Stuff. FOOD ANAL METHOD 2008. [DOI: 10.1007/s12161-008-9057-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Bohaychuk VM, Gensler GE, McFall ME, King RK, Renter DG. A real-time PCR assay for the detection of Salmonella in a wide variety of food and food-animal matricest. J Food Prot 2007; 70:1080-7. [PMID: 17536664 DOI: 10.4315/0362-028x-70.5.1080] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Conventional culture methods have traditionally been considered the "gold standards" for the isolation and identification of foodborne pathogens. However, culture methods are labor-intensive and time-consuming. We have developed a real-time PCR assay for the detection of Salmonella in a variety of food and food-animal matrices. The real-time PCR assay incorporates both primers and hybridization probes based on the sequence of the Salmonella invA gene and uses fluorescent resonance energy transfer technology to ensure highly sensitive and specific results. This method correctly classified 51 laboratory isolates of Salmonella and 28 non-Salmonella strains. The method was also validated with a large number of field samples that consisted of porcine feces and cecal contents, pork carcasses, bovine feces and beef carcasses, poultry cecal contents and carcasses, equine feces, animal feeds, and various food products. The samples (3388) were preenriched in buffered peptone water and then selectively enriched in tetrathionate and Rappaport-Vassiliadis broths. Aliquots of the selective enrichment broths were combined for DNA extraction and analysis by the real-time PCR assay. When compared with the culture method, the diagnostic sensitivity of the PCR assay for the various matrices ranged from 97.1 to 100.0%, and the diagnostic specificity ranged from 91.3 to 100.0%. Kappa values ranged from 0.87 to 1.00, indicating excellent agreement of the real-time PCR assay to the culture method. The reduction in time and labor makes this highly sensitive and specific real-time PCR assay an excellent alternative to conventional culture methods for surveillance and research studies to improve food safety.
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Affiliation(s)
- V M Bohaychuk
- Agri-Food Laboratories Branch, Food Safety Division, Alberta Agriculture and Food, 6909-116 Street, Edmonton, Alberta, Canada.
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15
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Wolffs PFG, Glencross K, Norling B, Griffiths MW. Simultaneous quantification of pathogenic Campylobacter and Salmonella in chicken rinse fluid by a flotation and real-time multiplex PCR procedure. Int J Food Microbiol 2007; 117:50-4. [PMID: 17462769 DOI: 10.1016/j.ijfoodmicro.2007.02.020] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2006] [Revised: 10/23/2006] [Accepted: 02/20/2007] [Indexed: 11/17/2022]
Abstract
A procedure for simultaneous quantification of Campylobacter and Salmonella spp. in poultry skin rinse fluids by a flotation and real-time multiplex PCR method is described. Flotation of the target organisms in a discontinuous density gradient separated them from background microflora, particles from poultry skin, dead target cells and PCR inhibitors. Variation of the buoyant density between 1.052 to 1.106 g/ml was measured at different times for various Salmonella strains grown over a period of 4 weeks. This, and the results from earlier studies on the buoyant densities of Campylobacter spp., which were between 1.065 and 1.109 g/ml, led to design of an optimal discontinuous flotation method with three density layers, of 1.048, 1.109 and approximately 1.200 g/ml. This method preceded a real-time multiplex PCR assay using hybridization probes. The specificity of the PCR assay was confirmed on 73 target and non-target strains, and target organisms were detected at the level of one genome per PCR. Results obtained with the combined flotation and real-time multiplex PCR method showed that quantification in rinse fluids was possible down to 3.0+/-0.3 x 10(3) CFU/ml in the presence of other microorganisms at numbers up to 10(9) CFU/ml.
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Affiliation(s)
- Petra F G Wolffs
- Canadian Research Institute for Food Safety, Guelph University, Guelph, Canada.
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16
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Gunaydin E, Eyigor A, Carli KT. A capillary polymerase chain reaction for Salmonella detection from poultry meat. Lett Appl Microbiol 2007; 44:24-9. [PMID: 17209810 DOI: 10.1111/j.1472-765x.2006.02033.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS In this study, a capillary polymerase chain reaction (cPCR) was applied for Salmonella detection from poultry meat. METHODS AND RESULTS Salmonella detection limits of the optimized cPCR were determined with DNA templates from the samples of tetrathionate broth (TTB), Rappaport Vassiliadis broth (RVB) and selenite cystine broth (SCB) artificially contaminated with 10-fold dilutions of 6 x 10(8) CFU ml(-1) of pure Salmonella enterica ssp. enterica serovar Enteritidis 64K stock culture. Detection limits of cPCR from TTB, RVB and SCB were found as 6, 6 x 10(1) and 6 x 10(4) CFU ml(-1), respectively. In addition, detection limits of bacteriology were also determined as 6 CFU ml(-1) with TTB and SCB, and 6 x 10(1) CFU ml(-1) with RVB. A total of 200 samples, consisting of 100 chicken and 100 turkey meat samples, were tested with optimized cPCR and bacteriology. Eight and six per cent of the chicken meat samples were found to harbour Salmonella by cPCR and standard bacteriology, respectively. Of six Salmonella isolates, four belonged to serogroup D, two to serogroup B. CONCLUSIONS The TTB cultures of both artificially and naturally contaminated samples were found to be superior to those of RVB and SCB cultures in their cPCR results. This cPCR, utilizing template from 18-h TTB primary enrichment broth culture, takes approximately 40 min in the successful detection of Salmonella from poultry meat. SIGNIFICANCE AND IMPACT OF THE STUDY This study shows that cPCR from TTB enrichment culture of poultry meat would enable rapid detection of Salmonella in laboratories with low sample throughput and limited budget.
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Affiliation(s)
- E Gunaydin
- Department of Microbiology, Faculty of Veterinary Medicine, Uludag University, Bursa, Turkey
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17
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Wolffs PFG, Glencross K, Thibaudeau R, Griffiths MW. Direct quantitation and detection of salmonellae in biological samples without enrichment, using two-step filtration and real-time PCR. Appl Environ Microbiol 2006; 72:3896-900. [PMID: 16751494 PMCID: PMC1489624 DOI: 10.1128/aem.02112-05] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A new two-step filtration protocol followed by a real-time PCR assay based on SYBR green I detection was developed to directly quantitate salmonellae in two types of biological samples: i.e., chicken rinse and spent irrigation water. Four prefiltration filters, one type of final filter, and six protocols for recovery of salmonellae from the final filter were evaluated to identify an effective filtration protocol. This method was then combined with a real-time PCR assay based on detection of the invA gene. The best results were obtained by subsequent filtration of 100 ml of chicken rinse or 100 ml of spent irrigation water through filters with pore diameters of >40 mum to remove large particles and of 0.22 microm to recover the Salmonella cells. After this, the Salmonella cells were removed from the filter by vortexing in 1 ml of physiological saline, and this sample was then subjected to real-time quantitative PCR. The whole procedure could be completed within 3 h from sampling to quantitation, and cell numbers as low as 7.5 x 10(2) CFU per 100-ml sample could be quantified. Below this limit, qualitative detection of concentrations as low as 2.2 CFU/100 ml sample was possible on occasion. This study has contributed to the development of a simple, rapid, and reliable method for quantitation of salmonellae in food without the need for sample enrichment or DNA extraction.
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Affiliation(s)
- Petra F G Wolffs
- Department of Medical Microbiology, University Hospital Maastricht, P. Debyelaan 25, 6202 AZ Maastricht, The Netherlands.
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GLYNN BARRY, LAHIFF SINEAD, WERNECKE MARTINA, BARRY THOMAS, SMITH TERRYJ, MAHER MAJELLA. Current and emerging molecular diagnostic technologies applicable to bacterial food safety. INT J DAIRY TECHNOL 2006. [DOI: 10.1111/j.1471-0307.2006.00253.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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19
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Hein I, Flekna G, Krassnig M, Wagner M. Real-time PCR for the detection of Salmonella spp. in food: An alternative approach to a conventional PCR system suggested by the FOOD-PCR project. J Microbiol Methods 2006; 66:538-47. [PMID: 16564585 DOI: 10.1016/j.mimet.2006.02.008] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Revised: 02/01/2006] [Accepted: 02/09/2006] [Indexed: 11/29/2022]
Abstract
A real-time PCR assay using non-patented primers and a TaqMan probe for the detection and quantification of Salmonella spp. is presented. The assay is based on an internationally validated conventional PCR system, which was suggested as a standard method for the detection of Salmonella spp. in the FOOD-PCR project. The assay was sensitive and specific. Consistent detection of 9.5 genome equivalents per PCR reaction was achieved, whereas samples containing an average of 0.95 genome equivalents per reaction were inconsistently positive. The assay performed equally well as a commercially available real-time PCR assay and allowed sensitive detection of Salmonella spp. in artificially contaminated food. After enrichment for 16 h in buffered peptone water (BPW) or universal pre-enrichment broth (UPB) 2.5 CFU/25 g salmon and minced meat, and 5 CFU/25 g chicken meat and 25 ml raw milk were detected. Enrichment in BPW yielded higher numbers of CFU/ml than UPB for all matrices tested. However, the productivity of UPB was sufficient, as all samples were positive with both real-time PCR methods, including those containing less than 300 CFU/ml enrichment broth (enrichment of 5 CFU/25 ml raw milk in UPB).
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Affiliation(s)
- Ingeborg Hein
- Institute of Milk Hygiene, Milk Technology, and Food Science, Department of Veterinary Public Health and Food Science, University of Veterinary Medicine, Veterinaerplatz 1, A-1210 Vienna, Austria.
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20
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Patel JR, Bhagwat AA, Sanglay GC, Solomon MB. Rapid detection of Salmonella from hydrodynamic pressure-treated poultry using molecular beacon real-time PCR. Food Microbiol 2006; 23:39-46. [PMID: 16942984 DOI: 10.1016/j.fm.2005.01.011] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2004] [Revised: 12/15/2004] [Accepted: 01/05/2005] [Indexed: 11/24/2022]
Abstract
A real-time polymerase chain reaction (PCR) assay was evaluated to detect Salmonella in hydrodynamic pressure (HDP)-treated chicken using molecular beacon probes available as a commercial kit (iQ-Check, Bio-Rad Laboratories). The sensitivity and accuracy of the assay were compared with the conventional USDA microbiological procedure using artificially contaminated minced chicken. Chicken fillets were irradiated at 10 kGy to completely destroy any naturally occurring Salmonella. These fillets were minced and inoculated with as low as 2+/-1 cfu of S. typhimurium per 25 g chicken. The minced chicken samples were vacuum packed in multi-layer barrier bags, heat shrunk, and treated with HDP. Results showed that all inoculated samples (n=36) were detected by the PCR assay and conventional USDA procedure. Similarly, all uninoculated controls (n=11) were negative by both PCR assay and USDA procedure. As few as 2+/-1 cfu could be detected from 25 g HDP-treated chicken following 16-18 h enrichment in buffered peptone water. Real-time PCR proved to be an effective method for Salmonella detection in HDP-treated chicken with high sensitivity and more importantly, a rapid and high-throughput detection in 18 h, compared to 3-8 days for the conventional microbiological methods. HDP treatment, which has been reported to reduce spoilage bacteria in various meats, was unable to kill pathogenic Salmonella in minced chicken.
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Affiliation(s)
- J R Patel
- Food Technology and Safety Laboratory, Agricultural Research Service, USDA, Bldg. 201, 10300 Baltimore Avenue, Beltsville, MD 20705-2350, USA.
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21
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Eyigor A, Goncagul G, Gunaydin E, Carli KT. Salmonella profile in chickens determined by real-time polymerase chain reaction and bacteriology from years 2000 to 2003 in Turkey. Avian Pathol 2005; 34:101-5. [PMID: 16191689 DOI: 10.1080/03079450500059461] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
From years 2000 to 2003, Salmonella was investigated from a total of 1785 samples comprised of chicken intestinal samples, cloacal swabs, drag swabs, litter samples and chick dust samples collected from 191 poultry breeding flocks belonging to 15 different chicken breeding stock companies in the Marmara region, Turkey by a SYBR green-based real-time polymerase chain reaction (SGBRT-PCR), by a probe-specific real-time polymerase chain reaction (PSRT-PCR) and by standardized bacteriology as described in the manual of National Poultry Improvement Plan and Auxillary Provisions, United States Department of Agriculture. Between January 2000 and July 2001, Salmonella was detected at the rates of 5.87% and 4.10% out of a total of 1242 samples by SGBRT-PCR and bacteriology, respectively. From July 2001 until December 2003, Salmonella was found at rates of 11.42% and 5.52% from a total of 543 samples by PSRT-PCR and bacteriology, respectively. The dominant Salmonella serovar was determined as Salmonella enterica subsp. enterica Serovar Enteritidis (S. Enteritidis), while serogroup C1 and C2 in 2001 and serogroup E1 in 2002 were isolated as additional serovars. As a conclusion, S. Enteritidis seems to be the major problem in poultry breeding flocks in Turkey, and both of the real-time polymerase chain reaction methods were found more sensitive than standard bacteriology for the detection of Salmonella from poultry samples.
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Affiliation(s)
- Aysegul Eyigor
- Department of Food Hygiene and Technology, Uludag University, Gorukle Kampusu, Bursa, Turkey
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22
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Yang FL, Jia WX, Yue H, Luo W, Chen X, Xie Y, Zen W, Yang WQ. Development of Quantitative Real-Time Polymerase Chain Reaction for Duck Enteritis Virus DNA. Avian Dis 2005; 49:397-400. [PMID: 16252495 DOI: 10.1637/7338-020305r.1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Duck enteritis virus (DEV) is a herpesvirus that causes an acute, contagious, and fatal disease. In the present article, we introduce a quantitative real-time polymerase chain reaction (PCR) assay for DEV DNA using TaqMan technology and a two-step protocol. It was confirmed to be rapid, sensitive, and specific for DEV detection. The primers and probe were designed and directed to the DNA polymerase gene of DEV. The method will provide a valuable tool for rapid laboratory diagnosis of DEV infection. By virtue of its high-throughput format and its ability to accurately quantify the viral DNA, the method may be useful for large epidemiological surveys and clarification of pathogenesis, such as latency and reactivation of the virus.
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Affiliation(s)
- Fa-Long Yang
- Department of Microbiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, 610041, PR China
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23
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Ahn S, Walt DR. Detection ofSalmonellaspp. Using Microsphere-Based, Fiber-Optic DNA Microarrays. Anal Chem 2005; 77:5041-7. [PMID: 16053320 DOI: 10.1021/ac0505270] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Salmonella spp. are one of the most problematic food pathogens in public health, as they are responsible for food poisoning associated with contamination of meat, poultry, and eggs. Thus, rapid and sensitive detection of Salmonella spp. is required to ensure food safety. In this study, a fiber-optic DNA microarray using microsphere-immobilized oligonucleotide probes specific for the Salmonella invA and spvB genes was developed for detection of Salmonella spp. Microarrays were prepared by randomly distributing DNA probe-functionalized microspheres (3.1-microm diameter) into microwells created by etching optical fiber bundles. Hybridization of the probe-functionalized microspheres to target DNA from Salmonella was performed and visualized using Cy3-labeled secondary probes in a sandwich-type assay format. In this study, 10(3)-10(4) cfu/mL of the target organism could be detected after 1-h hybridization without any additional amplification. The DNA microarray showed no cross-reactivity with other common food pathogens, including E. coli and Y. enterocolitica, and could even detect Salmonella spp. from cocktails of bacterial strains with only moderate loss of sensitivity due to nonspecific binding. This work suggests that fiber-optic DNA microarrays can be used for rapid and sensitive detection of Salmonella spp. Since fiber-optic microarrays can be prepared with different probes, this approach could also enable the simultaneous detection of multiple food pathogens.
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Affiliation(s)
- Soohyoun Ahn
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, USA
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24
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Maciorowski KG, Pillai SD, Jones FT, Ricke SC. Polymerase chain reaction detection of foodborne Salmonella spp. in animal feeds. Crit Rev Microbiol 2005; 31:45-53. [PMID: 15839404 DOI: 10.1080/10408410590912970] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Foodborne salmonellosis continues to be a public health issue of considerable concern. Animal feed has been a major link in pre-harvest food animal production. Although monitoring systems and control measures are available to limit Salmonella spp. contamination on animal feeds detection methodology is relatively time consuming in the context of time inputs for feed processing and mixing. Current cultural methods of Salmonella spp. detection in feeds require several days for confirmation. This amount of time represents significant problems if control measures are to be effectively implemented in a fashion that keeps feed processing costs low. Molecular methods offer improved sensitivity and potential reduction in assay time. In particular, several commercial polymerase chain reaction (PCR) assays, and combined PCR-hybridization assays have been suggested as possible means to implement more rapid detection of Salmonella spp. extracted from animal feeds. It has now become possible to rapidly detect and confirm the presence of foodborne Salmonella spp. in feed matrices by commercial amplification detection systems. The primary challenges remaining are to develop more reliable recovery and extraction procedures for routine processing of samples from a wide variety of feed matrices and apply molecular techniques for assessing physiological status of Salmonella spp. contaminants in animal feeds.
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Affiliation(s)
- K G Maciorowski
- Department of Agriculture and Natural Resources, Delaware State University, Dover, Delaware, USA
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25
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Perelle S, Dilasser F, Malorny B, Grout J, Hoorfar J, Fach P. Comparison of PCR-ELISA and LightCycler real-time PCR assays for detecting Salmonella spp. in milk and meat samples. Mol Cell Probes 2004; 18:409-20. [PMID: 15488381 DOI: 10.1016/j.mcp.2004.07.001] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2004] [Accepted: 07/07/2004] [Indexed: 11/26/2022]
Abstract
In a previous study, we reported the performance of a PCR assay amplifying 285-bp of the invA gene of Salmonella spp. through an international ring-trial involving four participating laboratories [Int. J. Food Microbiol. 89 (2003) 241]. Based on the validated set of primers and recent advancements in PCR technology, we have designed two specific PCR assays for detecting Salmonella spp. We have compared PCR-enzyme-linked immunosorbent assay (PCR-ELISA) and LightCycler real-time PCR assay (LC-PCR) with the standard ISO 6579 bacteriological reference method. The two PCR tests incorporated an internal amplification control (IAC) co-amplified with the invA gene of Salmonella to monitor potential PCR inhibitors and ensure successful amplification. The selectivity study involved 84 Salmonella and 44 non-Salmonella strains and the samples tested were represented by 60 artificially-contaminated samples of fish, minced beef and raw milk, and 92 naturally-contaminated milk and meat samples. When using either PCR-ELISA or LC-PCR assays, only Salmonella strains were detected. PCR-ELISA and LC-PCR assays gave with pure Salmonella cultures the same detection limit level of 10(3)CFU/ml, which corresponds respectively to 50 and 10 cells per PCR tube. Data on artificially contaminated samples indicated that both PCR methods were able to detect after enrichment less than five Salmonella cells in 25 g of food, giving 100% concordance with the ISO 6579 reference method. The results on naturally contaminated samples demonstrated that despite certain inhibition problems, LC-PCR and PCR-ELISA assays were highly specific and sensitive, and provide a powerful tool for detection of Salmonella in food samples.
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Affiliation(s)
- Sylvie Perelle
- Agence Française de Sécurité Sanitaire des Aliments (AFSSA), Laboratoire d'Etudes et de Recherches sur la Qualité des Aliments et sur les Procédés Agroalimentaires (LERQAP), 1-5 rue de Belfort, 94700 Maisons-Alfort, France
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