Lyme disease is an inflammatory disease spread through a tick bite.
Primary Lyme disease is the first stage of the disease. For specific information on the other stages or general information about Lyme disease, see:
Early localized Lyme infection; Lyme borreliosis; Stage 1 Lyme disease; Lyme disease - primary
Lyme disease is caused by the bacteria Borrelia burgdorferi (B. burgdorferi). Certain ticks carry the bacteria. The ticks pick up the bacteria when they bite mice or deer that are infected with Lyme disease. You can get the disease if you are bitten by an infected tick.
The first stage of Lyme disease is considered the "primary" stage.
Risk factors for Lyme disease include walking in high grasses, taking place in activities that increase tick exposure, and having a pet that may carry ticks home.