Abstract
Human infections with non-typhoidal Salmonella (NTS) serovars are increasingly becoming a threat to human health globally. While all motile Salmonellae have zoonotic potential, Salmonella Enteritidis and Salmonella Typhimurium are most commonly associated with human disease, for which poultry are a major source. Despite the increasing number of human NTS infections, the epidemiology of NTS in poultry in India has not been fully understood. Hence, as a first step, we carried out epidemiological analysis to establish the incidence of NTS in poultry to evaluate the risk to human health. A total of 1215 samples (including poultry meat, tissues, egg and environmental samples) were collected from 154 commercial layer farms from southern India and screened for NTS. Following identification by cultural and biochemical methods, Salmonella isolates were further characterized by multiplex PCR, allele-specific PCR, enterobacterial repetitive intergenic consensus (ERIC) PCR and pulse field gel electrophoresis (PFGE). In the present study, 21/1215 (1.73 %) samples tested positive for NTS. We found 12/392 (3.06 %) of tissue samples, 7/460 (1.52 %) of poultry products, and 2/363 (0.55 %) of environmental samples tested positive for NTS. All the Salmonella isolates were resistant to oxytetracycline, which is routinely used as poultry feed additive. The multiplex PCR results allowed 16/21 isolates to be classified as S. Typhimurium, and five isolates as S. Enteritidis. Of the five S. Enteritidis isolates, four were identified as group D Salmonella by allele-specific PCR. All of the isolates produced different banding patterns in ERIC PCR. Of the thirteen macro restriction profiles (MRPs) obtained by PFGE, MRP 6 was predominant which included 6 (21 %) isolates. In conclusion, the findings of the study revealed higher incidence of contamination of NTS Salmonella in poultry tissue and animal protein sources used for poultry. The results of the study warrants further investigation on different type of animal feed sources, food market chains, processing plants, live bird markets etc., to evaluate the risk factors, transmission and effective control measures of human Salmonella infection from poultry products.
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References
Bakeri SA, Yasin RM, Koh YT et al (2003) Genetic diversity of human isolates of Salmonella enterica serovar Enteritidis in Malaysia. J Appl Microbiol 95:773–780
Bhowmick PP, Srikumar S, Devegowda D et al (2012) Serotyping and molecular characterization for study of genetic diversity among seafood associated nontyphoidal Salmonella serovars. Indian J Med Res 135:371–381
Varga C, Pearl DL, McEwen SA et al (2013) Incidence, distribution, seasonality, and demographic risk factors of Salmonella Enteritidis human infections in Ontario, Canada, 2007–2009. BMC Infect Dis 13:212
Gast RK, Guraya R, Guard J (2013) Salmonella enteritidis deposition in eggs after experimental infection of laying hens with different oral doses. J Food Prot 76:108–113
Grimont PA, Weill F (2007) Antigenic formulae of the Salmonella serovars, 9th edn. World Health Organization Collaborating Centre for Reference and Research on Salmonella, Institute Pasteur, Paris
Gast R (2003) Paratyphoid infections. In: Saif M, Barnes HJ, Fadly AM, Glisson JR, McDougald LR, Swayne DE (eds) Poult, 11th edn. Iowa State University Press, Ames, pp 583–613
Breuil J, Brisabois A, Casin I et al (2000) Antibiotic resistance in salmonellae isolated from humans and animals in France: comparative data from 1994 and 1997. J Antimicrob Chemother 46:965–971
CDC (1997) Multidrug resistant Salmonella serovar Typhimurium—United States, 1996. Morb Mort Wkly Rep 46:308–310
Davis MA, Hancock DD, Besser TE et al (1999) Changes in antimicrobial resistance among Salmonella enterica Serovar typhimurium isolates from humans and cattle in the Northwestern United States, 1982–1997. Emerg Infect Dis 5:802–806
Hatha AAM, Lakshmanaperumalsamy P (1997) Prevalence of Salmonella in fish and crustaceans in Coimbatore, South India. Food Microbiol 14:111–116
Suresh T, Srinivasan D, Hatha AAM, Lakshmanaperumalsamy P (2000) A study on the incidence, antimicrobial resistance and survival of Salmonella and E. coli isolated from broiler chicken retail outlets. Microbes Environ 15:173–181
Gopala Krishna Murthy T, Srinivasan P, Saravanan S, Mohan B (2011) Salmonella contamination in poultry. Indian Vet J 88:147–148
Murugadas V (2008) Molecular characterization of Salmonella enterica subsp. enterica from poultry and its products. M.V.Sc. thesis, Tamil Nadu Veterinary and Animal Sciences University
Purushothaman V, David P, Venkatesan R (1996) Comparison of plasmid profile analysis, serotyping, resistotyping, biotyping and antimicrobial susceptibility testing as epidemiological tools in the strain identification of Salmonella isolates from avian source. Indian J Anim Sci 66:419–430
Bauer R, Kirby MDK, Sherris JC, Turck M (1996) Antibiotic susceptibility testing by standard single disc diffusion method. Am J Clin Pathol 14:493–496
Cortez ALL, Carvalho ACFB, Ikuno AA et al (2006) Identification of Salmonella spp. isolates from chicken abattoirs by multiplex-PCR. Res Vet Sci 81:340–344
Shah DH, Park J-H, Cho M-R et al (2005) Allele-specific PCR method based on rfbS sequence for distinguishing Salmonella gallinarum from Salmonella pullorum: serotype-specific rfbS sequence polymorphism. J Microbiol Methods 60:169–177
Cao S-Y, Wang M-S, Cheng A-C et al (2008) Comparative analysis of intestinal microbial community diversity between healthy and orally infected ducklings with Salmonella enteritidis by ERIC-PCR. World J Gastroenterol (WJG) 14:1120–1125
Seo Y-S, Lee S-H, Shin E-K et al (2006) Pulsed-field gel electrophoresis genotyping of Salmonella gallinarum and comparison with random amplified polymorphic DNA. Vet Microbiol 115:349–357
Myint M (2004) Epidemiology of Salmonella contamination of poultry products: knowledge gaps in the farm to store products. Discussion submitted to Faculty of the Graduate School of University of Maryland, College Park
Davies R, Breslin M (2003) Observations on Salmonella contamination of commercial laying farms before and after cleaning and disinfection. Vet Rec 152:283–287
CDC (2011) Multistate outbreak of human salmonella heidelberg infections linked to “kosher broiled chicken livers” from Schreiber processing corporation. http://www.cdc.gov/salmonella/heidelberg-chickenlivers/111011/index.html?s_cid=ccu112111_015
Islam M, Das B, Hossain K et al (2003) A study of the occurrence of poultry diseases in sylhet region of Bangladesh. Int J PoultSci 2:354–356
Okoli I, Endujihe G, Ogbuewu I (2006) Frequency of isolation of Salmonella from commercial poultry feeds and their anti microbial resistance profiles. Online J Health Allied Sci 5:2–3
Veldman A, Vahl HA, Borggreve GJ, Fuller DC (1995) A survey of the incidence of Salmonella species and Enterobacteriaceae in poultry feeds and feed components. Vet Rec 136:169–172
Ward J, Griffin M, Egan J (1996) Evaluation of some rapid methods for the detection of Salmonella in poultry carcasses, feed and environmental samples. In: Proceedings of the monit. proced. rapid. detect. methods tech., Newbury, UK, pp 123–127
Wales A, Breslin M, Davies R (2006) Semiquantitative assessment of the distribution of Salmonella in the environment of caged layer flocks. J Appl Microbiol 101:309–318
Angen O, Skov M, Chriel M et al (1996) A retrospective study on Salmonella infection in Danish broiler flocks. Prev Vet Med 26:223–237
Davies RH, Nicholas RA, McLaren IM et al (1997) Bacteriological and serological investigation of persistent Salmonella enteritidis infection in an integrated poultry organisation. Vet Microbiol 58:277–293
Carrique-Mas JJ, Breslin M, Snow L et al (2009) Persistence and clearance of different Salmonella serovars in buildings housing laying hens. Epidemiol Infect 137:837–846
Gilchrist MJ, Greko C, Wallinga DB et al (2007) The potential role of concentrated animal feeding operations in infectious disease epidemics and antibiotic resistance. Environ Health Perspect 115:313–316
Threlfall EJ, Frost JA (1990) The identification, typing and fingerprinting of Salmonella: laboratory aspects and epidemiological applications. J Appl Bacteriol 68:5–16
Boxrud D, Pederson-Gulrud K, Wotton J et al (2007) Comparison of multiple-locus variable-number tandem repeat analysis, pulsed-field gel electrophoresis, and phage typing for subtype analysis of Salmonella enterica serotype Enteritidis. J Clin Microbiol 45:536–543
Torpdahl M, Sørensen G, Lindstedt B-A, Nielsen EM (2007) Tandem repeat analysis for surveillance of human Salmonella Typhimurium infections. Emerg Infect Dis 13:388–395
Verma N, Reeves P (1989) Identification and sequence of rfbS and rfbE, which determine antigenic specificity of group A and group D salmonellae. J Bacteriol 171:5694–5701
Desai AR, Shah DH, Shringi S et al (2005) An allele-specific PCR assay for the rapid and serotype-specific detection of Salmonella pullorum. Avian Dis 49:558–561
Versalovic J, Koeuth T, Lupski JR (1991) Distribution of repetitive DNA sequences in eubacteria and application to fingerprinting of bacterial genomes. Nucleic Acids Res 19:6823–6831
Saxena MK, Singh VP, Lakhcharua BD et al (2002) Strain differentiation of Indian isolates of Salmonella by ERIC-PCR. Res Vet Sci 73:313–314
Dionisi A, Carattoli A, Luzzi I et al (2006) Molecular genotyping of Salmonella abortionist by pulse field gel electrophoresis. Vet Microbiol 116:217–223
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The authors are thankful to the Tamil Nadu Veterinary and Animal Sciences University for financial support and The University of Nottingham (S.V.K. and R.A.) for technical input into this research work.
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Saravanan, S., Purushothaman, V., Murthy, T.R.G.K. et al. Molecular Epidemiology of Nontyphoidal Salmonella in Poultry and Poultry Products in India: Implications for Human Health. Indian J Microbiol 55, 319–326 (2015). https://doi.org/10.1007/s12088-015-0530-z
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DOI: https://doi.org/10.1007/s12088-015-0530-z