Competitive infection experiments performed with CBA mice. Mice were infected with a mixture of equal amounts of AJB715 (phoN) and one fimbrial deletion mutant. Ratios of SF22/AJB715 (A), EHW11/AJB715 (B), SF24/AJB715 (open circles) (C), EHW69/AJB715 (closed circles) (C), EHW12/AJB715 (D), EHW1/AJB715 (open circles) (E), or EHW65/AJB715 (closed circles) (E) recovered from feces over a 30-day time period are plotted as geometric means (circles) ± standard errors. (F) Ratios of RAK48/AJB715 (circles) or EHW21/AJB715 (squares) recovered from feces over a 30-day time period are plotted as geometric means (circles) ± standard errors.