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F18 fimbriated Escherichia coli are a newly described cause of postweaning diarrhea in pigs. Polyclonal rabbit antisera were raised to the antigenic variants, F18ab and F18ac, of these fimbriae and were used to develop monospecific sandwich enzyme-linked immunosorbent assays (ELISAs). The ELISAs were standardized with type cultures characterized by polymerase chain reaction techniques (PCR) and then used to conduct a study of the prevalence of F18 fimbriated E. coli in pigs in Northern Ireland. A total of 176 isolates were tested by ELISA and PCR. Eight isolates were positive for F18 by ELISA, of which 2 were shown to be false positives by PCR and one was PCR positive but ELISA negative. Of the 6 confirmed ELISA positives, all produced VT2 toxin and 3 produced ST toxin. Four positives were from serogroups O138 and O139, previously associated with porcine diarrhea.

Polyclonal Sandwich ELISAs to Detect F18 Fimbriated Escherichia Coli in Pigs in Northern Ireland