TABLE 3.

Ability of the bivalent bacterin to sterilize feeding ticks and prevent infection with B. burgdorferi

Parameter	No. (%) positive		P
	Controls (n = 15)	Bacterin (n = 15)
Dogs with B. burgdorferi- infected ticks	13 (87)	0	<0.0001
B. burgdorferi from skin at:
1 mo	12 (80)	0	<0.0001
3 mo	11 (73)	0	<0.0001
5 mo	9 (75)a	0	<0.0001
Total dogs infected	14 (93)	0	<0.0001
B. burgdorferi from joints
Elbow	6 (40)b	0	0.017
Carpus	3 (20)c	0	0.224
Knee	0	0
Tarsus	2 (13)	0	0.483
Total dogs infected	8 (53)	0	0.0022

^an = 12; three dogs were necropsied prior to the end of study due to joint stiffness or lameness.

^bIncludes two dogs that developed joint stiffness or lameness.

^cIncludes one dog that developed joint stiffness or lameness.