Changing deer populations, rising temperatures and other factors are driving ticks and their diseases into new areas.

As temperatures rise, ticks of several kinds are flourishing in ways that threaten people’s health. By Maggie Astor Lately, Shannon LaDeau and her colleagues have had unwelcome visitors at their ...

Tick populations appear to be climbing in the Portland area, and the skin-crawling thought of a tick bite might just sour a ...