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[E. coli strain K88+ isolated from pigs]

S Boiadzhiev, N Ianev, A Ivanov

    Veterinarno-Meditsinski Nauki
    |January 1, 1980
    PubMed
    Summary

    A study of 151 E. coli strains from pigs found that K88 antigen presence varied with temperature. Strains positive for K88 antigen produced it at 37°C but not at 18°C.

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    Area of Science:

    • Veterinary Microbiology
    • Bacterial Pathogenesis
    • Molecular Biology

    Background:

    • Escherichia coli (E. coli) is a significant pathogen in swine, causing enteric disease.
    • The K88 antigen is a virulence factor associated with E. coli adhesion in pigs.
    • Understanding the factors influencing K88 antigen expression is crucial for controlling swine diarrhea.

    Purpose of the Study:

    • To investigate the prevalence of K88 antigen in E. coli strains isolated from diarrheal pigs.
    • To determine the serogroups associated with K88-positive E. coli strains.
    • To assess the effect of cultivation temperature on K88 antigen production.

    Main Methods:

    • Isolation and identification of E. coli strains from diarrheal pig samples.
    • Serogrouping of E. coli isolates.
    • Detection of K88 antigen expression under different temperature conditions (37°C and 18°C).
    • Cultivation using raffinose and monitoring gas formation.

    Main Results:

    • Out of 151 E. coli strains, several were positive for the K88 antigen.
    • K88-positive strains belonged to serogroups O149, O141, O139, O138, O18, and one uncharacterized O-serogroup.
    • K88 antigen production was observed at 37°C but absent at 18°C.

    Conclusions:

    • Temperature significantly influences K88 antigen expression in E. coli.
    • Specific E. coli serogroups commonly carry the K88 antigen in pigs.
    • These findings contribute to understanding E. coli virulence and inform strategies for managing swine enteric diseases.

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