has role virmugen Escherichia coli gene virmugen role rfaL from Escherichia coli NCBI_Gene_ID: 948148; PMID: 19522648 Rebecca Racz Oliver He gene Deletion of waaL results in a strain that stimulates enhanced urothelial cytokine secretion, which is an enhanced innate immune response. Inoculation with the vaccine strain protected mice against challenge with a broad range of clinical uropathogenic E. coli isolates and produced immunity that lasted >=8 weeks.