Relationship between serogroups and enterotoxin production of Escherichia coli from children with diarrhoea

ABSTRACT

It has been reported that the enterotoxigenic Escherichia coli could be serotyped in various countries and some serotypes were restricted to each area. Thus a study was conducted on 2522 Escherichia coli isolates from 501 diarrhoeal cases and 374 control cases from the Intakaw survey. Enterotoxigenic strains were isolated from 91 cases of diarrhoea and from 29 control cases. It was found that the serogroups 0126 and 0114 were associated with heat-stable (ST) and heat-labile (LT) toxin producing isolates respectively. 027 and 06 serogroups showed a correlation with ST alone and STLT producers respectively. Though the other serogroups sought were 01, 026, 0119, 0159, 0127, 0128, 0148 and 0159, it was notedthat only 60 percent of the enterotoxigenic E. clli could be serogrouped. The serotyping of flagella was also done and different patterns including H8, H12, H19, H21, H32, H38, H49 and H51 were observed.