Prevalence of colonization factor antigens (CFAs) and adherence to HeLa cells in enterotoxigenic Escherichia coli isolated from feces of children in São Paulo.
Fifty-eight enterotoxigenic Escherichia coli (ETEC) strains, isolated from children with and without diarrhea in São Paulo, were examined for the presence of colonization factor antigens (CFAs) and their ability to adhere to HeLa cells. Antisera to CFA/I, the coli surface (CS) antigens CS1CS3, CS2CS3, and CS2 of CFA/II, CFA/III, and CS5CS6 and CS6 of CFA/IV were used. CFAs were identified in 43% of the ETEC strains: 40% of the CFAs strains with CFAs harbored CFA/I, 24% carried CFA/II (CS1CS3), 24% carried CFA/IV (CS6), and 12% carried CFA/IV (CS5CS6). CFAs occurred mainly among ETEC strains producing only heat-stable (ST-I) enterotoxin and in strains also producing heat-labile toxin (LT-I). No ETEC strains tested expressed CFA/III. A marked change in serotypes of ST-I-producing strains was found in São Paulo between 1979 and 1990. Adherence to HeLa cells was detected in 14% of the ETEC strains. All of them had a diffuse adherence pattern and produced only ST-I, and 88% carried CS6 antigen.
Department of Microbiology, Immunology and Parasitology, Escola Paulista de Medicina, São Paulo, Brazil.
B E
BE
Guth
E G
EG
Aguiar
P M
PM
Griffin
S R
SR
Ramos
T A
TA
Gomes
D000818:Animals; D000942:Antigens, Bacterial / Q000032:analysis / Q000276:immunology; D001422:Bacterial Adhesion; D001426:Bacterial Proteins / Q000032:analysis* / Q000276:immunology; D001938:Brazil / Q000453:epidemiology; D002675:Child, Preschool; D003967:Diarrhea / Q000453:epidemiology / Q000382:microbiology; D004768:Enterotoxins; D004926:Escherichia coli / Q000276:immunology* / Q000302:isolation & purification / Q000502:physiology; D005243:Feces / Q000382:microbiology*; D036781:Fimbriae Proteins; D006367:HeLa Cells / Q000378:metabolism; D006386:Hemagglutination Tests; D006801:Humans; D005779:Immunodiffusion; D007223:Infant; D010641:Phenotype; D015995:Prevalence; D011817:Rabbits
D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D004768:Enterotoxins; C022924:colonization factor antigens; D036781:Fimbriae Proteins