The most common symptoms of Lyme disease are a spreading bullseye rash at the location of the tick bite. This rash develops between three to 30 days after being bitten, but does not appear in every case. Other symptoms can include fever, headache, and fatigue, facial droop, nerve pain, and numbness or tingling in the hands or feet.

A vector ecologist explains the complexities of tracking tick-borne diseases like Lyme in a climate-changed world