 Some of the genes involved are "CsgA", "CsgB", "CsgC", "CsgD", "CsgE", "CsgF", and "CsgG".Fimbriae are one of the primary mechanisms of virulence for "E. coli", "Bordetella pertussis", "Staphylococcus" and "Streptococcus" bacteria.Their presence greatly enhances the bacteria's ability to attach to the host and cause disease.