Abstract:
:We compared a new colony hybridization assay with an established enzyme-linked immunosorbent assay for detection of enterotoxigenic Escherichia coli (ETEC) expressing colonization factor antigen I (CFA/I). The tests were applied to 135 human ETEC strains. Of these isolates, 30 had previously been characterized for CFAs. A strain harboring the plasmid vector of the polynucleotide gene probe, nine non-ETEC strains from healthy infants, and eight ETEC strains of animal origin were included for further evaluation of probe specificity. The two assays showed a high level of concordance in the specific detection of ETEC strains expressing CFA/I. A total of 24 strains tested positive in the CFA/I hybridization assay, while 23 of those strains were positive in the CFA/I enzyme-linked immunosorbent assay. The single discrepant result could be explained by the loss of a regulatory gene. The strain harboring the plasmid vector of the probe, the non-ETEC E. coli strains, and the ETEC strains of animal origin were all negative in the CFA/I probe assay.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
Grewal HM,Sommerfelt H,Gaastra W,Svennerholm AM,Bhan MK,Hamers AM,Kumar R,Wiklund G,Bjorvatn Bdoi
10.1128/JCM.28.10.2264-2268.1990subject
Has Abstractpub_date
1990-10-01 00:00:00pages
2264-8issue
10eissn
0095-1137issn
1098-660Xjournal_volume
28pub_type
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journal_title:Journal of clinical microbiology
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