The black-legged tick feeds on the blood of large mammals, generally deer. It is also the main transmitter of Lyme disease to humans in the U.S. Early symptoms of Lyme disease include a large red rash at the site of the tick bite followed by flu-like chills, fever,
joint ache, and a stiff neck. Severe cases may develop chronic
arthritis up to a year after the bite. The black-legged tick is one of only two species that is believed to transmit Lyme disease to humans. While not a true insect, ticks are arthropods, which are related.
Source: Ohio State