Fig. 5.

ϕV1/7 enhances E. faecalis V583 colonization in a competitive ecosystem. (A) Competition between WT E. faecalis V583 or the ΔϕV7 strain in mixed coculture with E. faecalis CH188 in BHI broth. V583 was also competed with ϕV1/7-lysogenized CH188, which is resistant to ϕV1/7-mediated lysis (Fig. S6C). (B) Competition between WT E. faecalis V583 or ΔϕV7 and the susceptible strain CH188 from the feces of germ-free mice 24 h after cocolonization. Competition ratio is the ratio of the parental strain (V583 background) to the susceptible or lysogenized strain. Each data point represents one independent culture or individual mouse. Statistical analysis was done by a two-tailed Student t test. Error bars ± SEM *P < 0.05, **P < 0.005.