TABLE 2.

ID₅₀ of wild-type and revA-deficient B. burgdorferi strains^a

Strain and inoculum	No. culture positive/total no.
	Mice	Organsb
B31-A3
105	6/6	18/18
104	10/10	29/34
103	10/10	20/34
102	0/6	0/24
B31-A3ΔrevA1ΔrevA6
105	6/6	15/15
104	8/10	26/34
103	8/10	17/34
102	0/6	0/24

^aMice were infected subcutaneously with increasing inocula of the B. burgdorferi parental strain B31-A3 or the B31-A3ΔrevA1ΔrevA6 mutant. Mice were sacrificed 2 weeks postinfection, and organs were cultured.

^bIncluding bladders, hearts, ears, and tibiotarsal joints.