(Science: infectious disease) a bacterial disease caused by the micro-organism (spirochete) borrelia burgdorferi. This bacterium was discovered in 1982, although the clinical disease was first described in 1977. Infection occurs after the bite of an infected tick. The incubation period is approximately 14 days.
symptoms include a large circular red rash at the bite site (50-60% of cases), malaise, fever, headache, muscle aches and swollen lymph nodes. If untreated may progress to arthritis and compromise heart function.