Borrelia Burgdorferi -

This spirochete causes a characteristic annular rash, arthritis, carditis, and in late stages, encephalopathy. National Institutes of Health (.gov) Why Is Lyme Disease So Hard to Treat?

The bacterium lives in the midgut of certain ticks—primarily the (deer tick) in the Northeast and Midwest, and the western blacklegged tick on the Pacific Coast. borrelia burgdorferi

Transmission usually requires the tick to be attached for 36 to 48 hours or more. and in late stages