Genetic resistance for F18 Escherichia coli holds.

This article discusses the increase in cases of post-weaning diarrhea in pigs caused by Escherichia coli (E. coli) at the Iowa State University Veterinary Diagnostic Laboratory. The study found that F18 E. coli has become the predominant fimbrial type in these cases. The article explores various reasons for this increase, including changes in antimicrobial practices, increased antimicrobial resistance, and genetic susceptibility of specific breeds to F18 E. coli. The study also investigates the effect of F18 E. coli on susceptible and resistant pigs, finding that resistant pigs showed no signs of illness while susceptible pigs displayed clinical disease, mortality, and histological lesions. Overall, genetic resistance to F18 E. coli remains effective against contemporary isolates with higher virulence. [Extracted from the article]

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