FIG. 2.

Percentages of ticks infected with single A. marginale strains or coinfected following acquisition feeding on a superinfected reservoir host. The percentages of D. andersoni tick salivary gland pairs (SGP) in each infection category are indicated as follows: gray bars, coinfected ticks; open bars, EMΦ-infected ticks; black bars, St. Maries-infected ticks; cross-hatched bars, uninfected ticks. For calf 5854 two groups of ticks (60 ticks each) were used; one group was acquisition fed for 48 h, and the other group was acquisition fed 96 h. For calves 5877, 5882, 5890, and 5896 ticks (60 ticks/animal) were acquisition fed for 168 h.