Lyme disease is infectious disease that occurs in acute and chronic forms. The disease in its late stages can involve many different organs. The disease is caused by a bacteria known as a spirochete. Spirochetes are primitive organisms that also cause syphilis. Bacteria are carried by certain ticks and delivered through the skin by a tick bite. Most patients with Lyme disease are unaware of their tick bite. Untreated Lyme disease can lead to severe multisystem debilitating disease.