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. 1997 Aug;35(8):1952–1958. doi: 10.1128/jcm.35.8.1952-1958.1997

HEp-2 cell adherence patterns, serotyping, and DNA analysis of Escherichia coli isolates from eight patients with AIDS and chronic diarrhea.

Y Polotsky 1, J P Nataro 1, D Kotler 1, T J Barrett 1, J M Orenstein 1
PMCID: PMC229883  PMID: 9230362

Abstract

Three morphologic patterns of interaction between bacteria and enterocytes have been observed in colonic biopsy specimens from AIDS patients with chronic diarrhea in the United States. The DNA encoding virulence factors and the HEp-2 cell adherence patterns of Escherichia coli strains isolated from the stools of eight symptomatic AIDS patients were compared with those of five control strains with known adherence patterns. One clinical isolate from a patient with attaching-and-effacing enteropathy displayed the localized adherence attaching-and-effacing pattern typical of enteropathogenic E. coli on HEp-2 cells, five isolates displayed the "stacked-brick" aggregative adherence pattern typical of enteroaggregative E. coli strains, and one isolate showed the pattern characteristic of diffusely adherent E. coli. One patient's isolate displayed features of all three patterns. No clinical isolate hybridized with standard probes for enteropathogenic, enteroaggregative, diffusely adherent, enterotoxigenic, and enteroinvasive E. coli strains. Thus, isolates from symptomatic AIDS patients in the United States can display the same interactive patterns with HEp-2 cells as the agents of pediatric or traveler's diarrhea, but lack their typical virulence factors.

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Selected References

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