symptoms of advanced lyme disease in humans
Lyme disease is caused by the bacterium Borrelia burgdorferi, which is spread to humans by tick bites. In the days or weeks after a tick bite, early Lyme disease typically causes a rash and flu-like symptoms. Left untreated, advanced or late-stage Lyme disease can lead to a number of symptoms months or even years after the initial tick bite. Complications of advanced Lyme disease commonly affect the joints, nervous system and heart.