Fimbriae (also know as pili) are polar filaments found on the bacterial surface, allowing colonisation of the host. This family consists of the minor and major fimbrial subunits.

1: Identification and characterization of a K88- and CS31A-like operon of a rabbit enteropathogenic Escherichia coli strain which encodes fimbriae involved in the colonization of rabbit intestine. Adams LM, Simmons CP, Rezmann L, Strugnell RA, Robins-Browne RM; Infect Immun 1997;65:5222-5230. PMID:9393819