| 2004 |
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| Genotypes and phenotypes of Shiga toxin producing-Escherichia coli isolated from
healthy cattle in Thailand. |
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| Panutdaporn, N., Chongsa-nguan, M., Nair, G. B., Ramamurthy, T., Yamasaki, S., Chaisri, U.,
Tongtawe, P., Eampokalarp, B., Tapchaisri, P., Sakolvaree, Y., Kurazono, H., Thein, W. B., Hayashi, H., Takeda, Y., and Chaicumpa, W. |
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| Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand |
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| Abstract: Shiga toxin producing-Escherichia coli (STEC) has not yet been identified as an
important aetiologic agent of human disease in Thailand. To evaluate the potential for STEC to contribute to human disease in Thailand, 139 fecal
samples were collected from healthy cattle from five different provinces and analysed by genotypic and phenotypic methods for STEC. Of 139 samples,
27 (19.4%) were positive for stx1 and/or stx2 by multiplex polymerase chain reaction, or for O157 lipopolysaccharide (LPS) by immunoassay. Isolates
positive for stx and/or O157 were subdivided into 49 strains that varied in the presence of the virulence determinants stx1+/stx2+ (22 strains), stx2+ (22
strains), stx1+ (4 strains), and O157 LPS (1 strain). Within these 49 distinguishable strains, other virulence determinants varied as follows: hlyA+ (77.6%),
eae+ and tir+ (4.1%), and katP+ (6.12%). The most predominant profile (22 isolates) was stx1+/stx2+, eae-, tir-, etpD-, hlyA+, katP-. For further
characterization of the isolated strains by two molecular typing assays, plasmid profiles and ERIC PCR were performed. The results suggest that the
genetic and phenotypic profiles of STEC associated with human disease are not prevalent at this time in cattle in Thailand |
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| Published in:J.Infect. 48[2], 149-160. 2004. |
