TABLE 2.

Mortality rate of infant mice infected intravesically

Bacterial strain injecteda	No. of mice infectedb	Mortality rate (%)
536	38	100
536rfaH::cat	39	18c
536rfaH::cat (pGEM T-Easy)	41	15c
536rfaH::cat (pSMK1)	35	63d

^aMice were infected intravesically with 25 μl of bacterial suspension (10⁷ CFU/ml) directly through the abdominal wall.

^bSix to 14 mice were infected simultaneously, and four independent experiments were performed.

^cSignificantly different in comparison to mortality rate elicited by the wild-type strain (χ² probe, P < 0.001).

^dSignificantly different in comparison to mortality rate elicited by strain 536rfaH::cat (χ² probe, P < 0.001).