Table 5.

ID50 determination for nonclonal P48 B. burgdorferi strain B31

InoculumNo. of cultures positive/total no.No. positive mice/total no. of miceCalculated ID50
SpleenJointHeartBladderSkinAll sitesSkinOther sites
1053/33/33/33/32/314/153/36.8 × 1021.6 × 102
1043/33/33/33/32/314/153/3
1033/33/33/33/33/315/153/3
1020/30/30/30/30/30/150/3
1010/30/30/30/30/30/150/3