FIG. 2.

Colonization of the bovine and ovine intestine by 85-170 Nal^r ΔtccP::Kan^r (ICC203) in mixed-infection experiments with the wild-type strain in 14-day-old calves (A) and 6-week-old lambs (B). The level of colonization is indicated by the mean log-transformed viable count (CFU/g) of fecal samples taken once daily for 11 days postinoculation. The error bars indicate the standard errors of the means. To assess the possibility of cross-complementation of the tccP defect, 85-170 Nal^r and ICC203 were fed separately to groups of three lambs (C). No statistically significant difference was observed between colonization in lambs infected with ICC203 and that in the wild-type control (C).