P-fimbriae have been found to be a virulence factor in both human and nonhuman primate urinary tract infections caused by Escherichia coli. This is because of bacterial adherence to urothelial cells which is mediated by adherence of fimbriae to a specific glycolipid receptor on the cell membrane of these cells. We purified P-fimbriae for immunization of monkeys. High titers of antifimbrial antibody protected against both acute and chronic pyelonephritis after renal inoculations of P-fimbriate Escherichia coli.

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