a pilus antigen of Escherichia coli; provides adhesion of the bacteria to the epithelial lining of the intestine of piglets. Important in both neonatal and postweaning diarrhea. Called also F4.
The porcine intestinal receptor for Escherichia coli K88ab, K88ac: regional localization on chromosome 13 and influence of IgG response to the K88 antigen.