American Dog Tick Surveillance

At a glance

The American dog tick (Dermacentor variabilis) is widely distributed east of the Rocky Mountains, but also occurs in limited areas west of the Rocky Mountains. Newly described D. similis is found west of the Rocky Mountains. More research is needed to understand the role of these species in disease transmission. The highest risk of being bitten occurs during spring and summer. Adult females are most likely to bite humans.

Dermacentor variabilis, American dog tick, on a blade of grass

Data dashboard

To access the data used for this dashboard go to data sets.