Affiliation:
1. Enteric Diseases and Food Safety Research Unit, National Animal Disease Center, USDA Agricultural Research Service, Ames, Iowa 50010
Abstract
ABSTRACT
Toxin-producing
Escherichia coli
expressing F18 fimbriae colonizes the small intestines of weaned pigs and causes diarrhea, edema disease, or both. The F18 family is composed of two antigenic variants, F18ab and F18ac. Because many strains do not express F18 fimbriae in vitro, identification and differentiation of these two variants are difficult. Single-strand conformational polymorphism (SSCP) analysis is a rapid method for identifying genetic mutations and polymorphisms. The F18 major fimbrial subunit genes (
fedA
) of 138 strains were amplified by PCR, and genetic differences were detected by SSCP analysis. The SSCP analysis of the
fedA
gene differentiated F18ab
+
strains from F18ac
+
strains. Most strains classified as F18ab
+
by SSCP analysis contained Shiga toxin 2e and enterotoxin genes. Most strains classified as F18ac
+
by SSCP analysis contained only enterotoxin genes. The SSCP analysis was a useful method for predicting the antigenicity of F18
+
E. coli
and could also be used for analysis of other virulence genes in
E. coli
and other pathogenic bacteria.
Publisher
American Society for Microbiology
Subject
Microbiology (medical),Clinical Biochemistry,Immunology,Immunology and Allergy
Cited by
22 articles.
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