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Prevalence and genetic characterization of shiga toxin-producing Escherichia coli isolates from slaughtered animals in Bangladesh.
Appl Environ Microbiol. 2008 Sep; 74(17):5414-21.AE

Abstract

To determine the prevalence of Shiga toxin (Stx)-producing Escherichia coli (STEC) in slaughter animals in Dhaka, Bangladesh, we collected rectal contents immediately after animals were slaughtered. Of the samples collected from buffalo (n = 174), cows (n = 139), and goats (n = 110), 82.2%, 72.7%, and 11.8% tested positive for stx(1) and/or stx(2), respectively. STEC could be isolated from 37.9%, 20.1%, and 10.0% of the buffalo, cows, and goats, respectively. STEC O157 samples were isolated from 14.4% of the buffalo, 7.2% of the cows, and 9.1% of the goats. More than 93% (n = 42) of the STEC O157 isolates were positive for the stx(2), eae, katP, etpD, and enterohemorrhagic E. coli hly (hly(EHEC)) virulence genes. STEC O157 isolates were characterized by seven recognized phage types, of which types 14 (24.4%) and 31 (24.4%) were predominant. Subtyping of the 45 STEC O157 isolates by pulsed-field gel electrophoresis showed 37 distinct restriction patterns, suggesting a heterogeneous clonal diversity. In addition to STEC O157, 71 STEC non-O157 strains were isolated from 60 stx-positive samples from 23.6% of the buffalo, 12.9% of the cows, and 0.9% of the goats. The STEC non-O157 isolates belonged to 36 different O groups and 52 O:H serotypes. Unlike STEC O157, most of the STEC non-O157 isolates (78.9%) were positive for stx(1). Only 7.0% (n = 5) of the isolates were positive for hly(EHEC), and none was positive for eae, katP, and etpD. None of the isolates was positive for the iha, toxB, and efa1 putative adhesion genes. However, 35.2% (n = 25), 11.3% (n = 8), 12.7% (n = 9), and 12.7% (n = 9) of the isolates were positive for the lpf(O113), saa, lpfA(O157/01-141), and lpfA(O157/OI-154) genes, respectively. The results of this study provide the first evidence that slaughtered animals like buffalo, cows, and goats in Bangladesh are reservoirs for STEC, including the potentially virulent STEC strain O157.

Authors+Show Affiliations

Enteric and Food Microbiology Laboratory, Laboratory Sciences Division, ICDDR,B, GPO Box-128, Dhaka-1000, Bangladesh. maislam@icddrb.orgNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18641151

Citation

Islam, Mohammad A., et al. "Prevalence and Genetic Characterization of Shiga Toxin-producing Escherichia Coli Isolates From Slaughtered Animals in Bangladesh." Applied and Environmental Microbiology, vol. 74, no. 17, 2008, pp. 5414-21.
Islam MA, Mondol AS, de Boer E, et al. Prevalence and genetic characterization of shiga toxin-producing Escherichia coli isolates from slaughtered animals in Bangladesh. Appl Environ Microbiol. 2008;74(17):5414-21.
Islam, M. A., Mondol, A. S., de Boer, E., Beumer, R. R., Zwietering, M. H., Talukder, K. A., & Heuvelink, A. E. (2008). Prevalence and genetic characterization of shiga toxin-producing Escherichia coli isolates from slaughtered animals in Bangladesh. Applied and Environmental Microbiology, 74(17), 5414-21. https://doi.org/10.1128/AEM.00854-08
Islam MA, et al. Prevalence and Genetic Characterization of Shiga Toxin-producing Escherichia Coli Isolates From Slaughtered Animals in Bangladesh. Appl Environ Microbiol. 2008;74(17):5414-21. PubMed PMID: 18641151.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Prevalence and genetic characterization of shiga toxin-producing Escherichia coli isolates from slaughtered animals in Bangladesh. AU - Islam,Mohammad A, AU - Mondol,Abdus S, AU - de Boer,Enne, AU - Beumer,Rijkelt R, AU - Zwietering,Marcel H, AU - Talukder,Kaisar A, AU - Heuvelink,Annet E, Y1 - 2008/07/18/ PY - 2008/7/22/pubmed PY - 2008/10/1/medline PY - 2008/7/22/entrez SP - 5414 EP - 21 JF - Applied and environmental microbiology JO - Appl Environ Microbiol VL - 74 IS - 17 N2 - To determine the prevalence of Shiga toxin (Stx)-producing Escherichia coli (STEC) in slaughter animals in Dhaka, Bangladesh, we collected rectal contents immediately after animals were slaughtered. Of the samples collected from buffalo (n = 174), cows (n = 139), and goats (n = 110), 82.2%, 72.7%, and 11.8% tested positive for stx(1) and/or stx(2), respectively. STEC could be isolated from 37.9%, 20.1%, and 10.0% of the buffalo, cows, and goats, respectively. STEC O157 samples were isolated from 14.4% of the buffalo, 7.2% of the cows, and 9.1% of the goats. More than 93% (n = 42) of the STEC O157 isolates were positive for the stx(2), eae, katP, etpD, and enterohemorrhagic E. coli hly (hly(EHEC)) virulence genes. STEC O157 isolates were characterized by seven recognized phage types, of which types 14 (24.4%) and 31 (24.4%) were predominant. Subtyping of the 45 STEC O157 isolates by pulsed-field gel electrophoresis showed 37 distinct restriction patterns, suggesting a heterogeneous clonal diversity. In addition to STEC O157, 71 STEC non-O157 strains were isolated from 60 stx-positive samples from 23.6% of the buffalo, 12.9% of the cows, and 0.9% of the goats. The STEC non-O157 isolates belonged to 36 different O groups and 52 O:H serotypes. Unlike STEC O157, most of the STEC non-O157 isolates (78.9%) were positive for stx(1). Only 7.0% (n = 5) of the isolates were positive for hly(EHEC), and none was positive for eae, katP, and etpD. None of the isolates was positive for the iha, toxB, and efa1 putative adhesion genes. However, 35.2% (n = 25), 11.3% (n = 8), 12.7% (n = 9), and 12.7% (n = 9) of the isolates were positive for the lpf(O113), saa, lpfA(O157/01-141), and lpfA(O157/OI-154) genes, respectively. The results of this study provide the first evidence that slaughtered animals like buffalo, cows, and goats in Bangladesh are reservoirs for STEC, including the potentially virulent STEC strain O157. SN - 1098-5336 UR - https://www.unboundmedicine.com/medline/citation/18641151/Prevalence_and_genetic_characterization_of_shiga_toxin_producing_Escherichia_coli_isolates_from_slaughtered_animals_in_Bangladesh_ L2 - http://aem.asm.org/cgi/pmidlookup?view=long&pmid=18641151 DB - PRIME DP - Unbound Medicine ER -