TABLE 3.

Infectious dose determination

Dose (no. of spirochetes/mouse)No. of mice positive/no. inoculated with strain:
A3ospCK1/pBSV2G-ospCospCK1
200/60/6NDa
1000/61/6ND
5000/62/6ND
2,0003/63/6ND
10,0002/2ND0/5
1,000,0002/2ND0/5
  • a ND, not determined.