What external structures are found for bacteria?

Pilli (made of pillin protein, similar role to cilia, could be an adherence role like E.coli in urinary tract mediates attachment, pilli may by considered as virulence factors in the case of E.coli causing UTI, sex pilli cause conjugation role DNA exchange) Flagella (Differ from euakryotic, made by protein flagellin, flagella has H-antigen)