Lyme arthritis: a new clinical entity

Named for the Connecticut town where the first identified cases occurred in 1972, this disorder has since been found elsewhere and may be caused by a virus transmitted by ticks. Attacks are often preceded by erythema chronicum migrans and are seldom prolonged, though they may recur. Symptomatic treatment only is advised, except in the rare instances of severe neurologic complications or myocardial conduction abnormality.