Not all "cluster" diseases are noise

I recently got diagnosed with Lyme disease. So my knowledge of it seems to have grown over the past few days. Here is a trivia that I didn't know about: (cut and pasted from the FAQ on Lyme disease:

1.03 Why is the illness called "Lyme disease?"

"Lyme disease is named after a small coastal town in Connecticut called Lyme, where in 1975, a woman named Polly Murray brought to the attention of Yale researchers an unusual cluster of more than 51 cases of mostly pediatric arthritis. In 1977, Dr. Allen Steere and Yale colleagues identified the new clinical entity and named it "Lyme arthritis." In 1979, the name was changed to "Lyme disease," when Steere and colleague Dr. Steven Malawista discovered additional symptoms linked to the disease: problems of neurologic involvement and severe fatigue.

It wasn't until 1982 that the causative agent of the disease was discovered by Dr. Willy Burgdorfer. Burgdorfer published a paper on the infectious agent of Lyme disease, and earned the right to have his name placed on the Lyme disease spirochete now known as Borrelia burgdorferi. Borrelia burgdorferi (Bb) has since been the official taxonomic name of the Lyme disease spirochete. (Information from Forschner-Vanderhoof K., Everything You Need to Know About Lyme Disease)