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. 1978 Feb;19(2):727–736. doi: 10.1128/iai.19.2.727-736.1978

Detection and characterization of colonization factor of enterotoxigenic Escherichia coli isolated from adults with diarrhea.

D G Evans, D J Evans Jr, W S Tjoa, H L DuPont
PMCID: PMC414140  PMID: 344221

Abstract

The fimbriate colonization factor antigen (CEA) of Escherichia coli strain H-1047 was isolated and used to prepare anti-CFA antiserum. Enterotoxigenic E. coli (ETEC) isolated from 29 adults with diarrhea acquired in Mexico were examined for CFA by using this serum. Retrospectively, it was found that ETEC possessing the H-10407-type CFA were isolated from 25 (86%) of these diarrhea cases as compared with 2 of 11 (18%) from asymptomatic controls from whom ETEC had been isolated. CFA was found onE. coli of various serotypes, as demonstrated by bacterial agglutination by the anti-CFA serum. Heat treating the cells at 65 degress C for 1 h prevented the agglutination. CFA-positive strains did not react with anti-CFA serum when the cultures were grown at a low incubation temperature (18 degrees C). E. coli isolates identified serologically as CFA positive were shown to adhere to the intestinal villous surfaces of infant rabbits. By the indirect immunofluorescence technique, it was found that adhesion occurred preferentially in the upper 20 cm of the small intestine. Also, the ability or inability of various isolates to adhere to intestinal mucosa in vivo correlated with the presence or absence of fimbriae on the cells when grown in vitro. Agglutinability with anti-CFA serum, fimbriae, and adhesiveness were spontaneously lost by many isolates after laboratory passage in a manner previously described with E. coli H-10407. These observations suggest that the H-10407-type CFA plays a role in the virulence of ETEC possessing this antigen.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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