Fig. 8

Susceptibility of deer mice (Peromyscus maniculatus) to infection with GGI_A and GGII Borrelia hermsii when fed upon by infected ticks. Only the four mice fed upon by Ornithodoros hermsi infected with B. hermsii MTW (GGII) became spirochetemic. Three of these mice died on day 11 leaving only one mouse for the remainder of the experiment. No spirochetes were observed in any of the five mice fed upon by ticks infected with B. hermsii DAH (GGI_A) during the 21 days following tick bite and these results are not shown. Quantification of the spirochetes is described in the methods. Abbreviation: P.I., post-inoculation