The illness usually occurs during the summer months and generally starts as a circular reddish expanding rash around or near the site of the tick bite. Multiple rash sites may occur. These may last for several weeks. If left untreated, within a few weeks to months after the rash onset, complications such as meningitis, facial palsy or heart abnormalities may occur. Swelling and pain in the large joints may recur over many years.
Symptoms usually begin within a month of exposure.
Information available at present indicates that reinfection is possible. Current therapy includes the use of tetracycline or penicillin. Special precautions to prevent exposure to ticks should be used such as wearing light colored clothing and tucking pants into socks and shirts into pants. Repellents containing DEET applied to skin or clothing may prevent tick attachment. The control of rodents around the home may be helpful.