Protection in mice

Vaccine Seroconversion Culture Infected ticks Average no. of

to P39 after challenge spirochetes within

(positive/ (positive/ (positive/ infected ticks

examined) examined) examined (%)

- 5/8 4/10 8/22 (37) 300 - 1000

OspA 0/10 0/10 0/14 (0) 0

In collaboration with Yale U./Harvard U.

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