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Occurrence of Hybrid Escherichia coli Strains Carrying Shiga Toxin and Heat-Stable Toxin in Livestock of Bangladesh
Bangladesh (Icddr,b), International Center for Diarrheal Disease Research.
Bangladesh (icddr,b), International Center for Diarrheal Disease Research.
Bangladesh (icddr,b), International Center for Diarrheal Disease Research.
Bangladesh (icddr,b), International Center for Diarrheal Disease Research.
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2017 (English)In: Frontiers In Public Health, ISSN 2296-2565, Vol. 4, article id UNSP 287Article in journal (Refereed) Published
Abstract [en]

Shiga toxin-producing Escherichia coli (STEC) and enterotoxigenic E. coli (ETEC) are important causes of diarrhea in humans and animals worldwide. Although ruminant animals are the main source of STEC, diarrhea due to this pathotype is very low in Bangladesh where ETEC remains the predominant group associated with childhood diarrhea. In the present study, E. coli strains (n = 35) isolated from Bangladesh livestock (goats, sheep, and cattle) and poultry (chicken and ducks) were analyzed for the presence of major virulence factors, such as Shiga toxins (STX-1 and STX-2), heat-labile toxin, and heat-stable toxins (STa and STb). Multiplex polymerase chain reaction results revealed 23 (66%) E. coli strains to be virulent possessing either sta (n = 5), stx (stx1, n = 8; stx2, n = 2), or both (n = 8) genes in varying combinations. Thirty-four percent (8/23) of strains from livestock were hybrid type that carried both stx (either stx1 or stx2) and ETEC-specific enterotoxin gene sta. Serotyping results revealed that the ETEC strains belonged to five serotypes, namely O36: H5, O174: H-, O152: H8, O109: H51, and O8: H21, while the STEC-producing strains belonged to serotypes O76: H19 (n = 3), O43: H2 (n = 2), O87: H16 (n = 2), OR: H2 (n = 1), O110: H16 (n = 1), and O152: H8 (n = 1). The STEC-ETEC hybrid strains belonged to serotypes O76: H19 (n = 3), O43: H2 (n = 2), O87: H16, OR: H2, and O152: H8. Forty percent (2/5) of the ETEC and 20% (2/10) of the STEC strains were multidrug resistant with the highest drug resistance (50%) being found in the hybrid strains. Molecular fingerprinting determined by pulsed-field gel electrophoresis and cluster analyses by dendrogram revealed that, genetically, STEC-ETEC hybrid strains were highly heterogeneous. Multidrug-resistant E. coli STEC-ETEC hybrid strains in domesticated animals pose a public health threat for humans in Bangladesh.

Place, publisher, year, edition, pages
2017. Vol. 4, article id UNSP 287
Keywords [en]
Shiga-toxin, enterotoxin, livestock, hybrid, multidrug resistant, PFGE
National Category
Public Health, Global Health, Social Medicine and Epidemiology Occupational Health and Environmental Health
Identifiers
URN: urn:nbn:se:uu:diva-334108DOI: 10.3389/fpubh.2016.00287ISI: 000408409000001OAI: oai:DiVA.org:uu-334108DiVA, id: diva2:1160056
Funder
NIH (National Institute of Health), R01AI039129Available from: 2017-11-24 Created: 2017-11-24 Last updated: 2018-01-13Bibliographically approved

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