STH and infection: Several fimbriae have been implicated in facilitating long-term intestinal colonization of 129X1/SvJ [Saf, Bcf, Sti, and Std (Lawley et al., 2006)] and CBA mice [Lpf, Bcf, Stb, Stc, Std, and Sth (Weening et al., 2005)]; as deletion of these fimbriae did not result in a reduced recovery of S. Typhimurium from fecal samples of BALB/c mice at five days post infection (Weening et al., 2005), it appears that these fimbriae instead effect colonization in a temporal-manner, at different stages over the course of an infection.