Adherence‐associated characteristics and pathogenicity ofEscherichia colifrom avian colibacillosis

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Abstract
Escherichia coli isolates from avian colibacillosis were examined for adherence‐associated characteristics and post‐colonisation pathogenicity. The adherence‐associated characteristics studied included expression of pili, ability to partition with a hydrophobic phase, and ability to bind to Biosilon plastic polar‐surfaced microcarriers. None of the adherence‐associated characteristics correlated absolutely with post‐colonisation pathogenicity, and thus in vitro tests for these adherence‐associated characteristics cannot be used to predict whether any given E. coli avian colibacillosis isolate will exhibit post‐colonisation pathogenicity. The isolation of strain BT7 from avian colibacillosis, a piliated E. coli strain which binds to Biosilon polar‐surfaced plastic microcarriers, but is not pathogenic, is reported.