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Journal of Clinical Microbiology, Jul 1996, 1622-1627, Vol 34, No. 7
AW Paton, RM Ratcliff, RM Doyle, J Seymour-Murray, D Davos, JA Lanser and JC Paton
Shiga-like toxin-producing Escherichia coli (SLTEC) strains are a diverse
group of organisms which are known to cause diarrhea and hemorrhagic
colitis in humans. This can lead to potentially fatal systemic sequelae,
such as hemolytic-uremic syndrome (HUS). Strains belonging to more than 100
different O:H serotypes have been associated with severe SLTEC disease in
humans, of which only O157 strains (which are uncommon in Australia) have a
distinguishable cultural characteristic (sorbitol negative). During an
outbreak of HUS in Adelaide, South Australia, a sensitive PCR assay
specific for Shiga- like toxin genes (slt) was used to test cultures of
feces and suspected foods. This enabled rapid confirmation of infection and
identified a locally produced dry fermented sausage (mettwurst) as the
source of infection. Cultures of feces from 19 of 21 HUS patients and 7 of
8 mettwurst samples collected from their homes were PCR positive for slt- I
and slt-II genes. SLTEC isolates belonging to serotype O111:H- was
subsequently isolated from 16 patients and 4 mettwurst samples. Subsequent
restriction fragment length polymorphism analysis of chromosomal DNA from
these isolates with slt-specific probes indicated that at least three
different O111:H- genotypes were associated with the outbreak. Pulsed-field
gel electrophoresis of genomic DNA restricted with XbaI showed that two of
these restriction fragment length polymorphism types were closely related,
but the third was quite distinct. However, SLTEC strains of other
serotypes, including O157:H-, were also isolated from some of the HUS
patients.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Molecular microbiological investigation of an outbreak of hemolytic- uremic syndrome caused by dry fermented sausage contaminated with Shiga- like toxin-producing Escherichia coli
Molecular Microbiology Unit, Women's and Children's Hospital, North Adelaide, Australia. patonj@wch.sa.gov.au
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