| county-level surveillance of white-tailed deer infestation by ixodes scapularis and dermacentor albipictus (acari: ixodidae) along the illinois river. | from 1998 to 2003, 4,935 hunter-killed deer in northern and central illinois were examined for ticks; 4,066 blacklegged ticks, ixodes scapularis say, and 6,530 winter ticks, dermacentor albipictus (packard) (acari: ixodidae), were collected. i. scapularis was the predominant tick species in the northern portion of the study area, with a decreasing north-to-south prevalence gradient. in contrast, d. albipictus was more common in the south with a decreasing south-to-north prevalence gradient. comp ... | 2006 | 17017213 |