5. Bacterial virulence factors Y Adherence factors: pili capsule: K antigen Vi antigen endotoxin Y Exotoxin( ST, LT, SLT, shiga toxin (÷ art of the outer portion of the cell berated when the bacteria die and the cell wall breaks apart.5. Bacterial Virulence Factors Adherence factors: pili capsule: K antigen Vi antigen endotoxin Exotoxin (ST, LT, SLT, shiga toxin )