In the early 1970s, a mysterious clustering of arthritis occurred among children in Lyme, Connecticut, and surrounding towns. Medical researchers soon recognized the illness as a distinct disease, which they called . They subsequently described the clinical features of , established the usefulness of antibiotic therapy in its treatment, identified the deer tick as the key to its spread, and isolated the bacterium that caused it. is still mistaken for other diseases, and it continues to pose many other challenges: it can be difficult to diagn ....