are a group of illnesses or infections caused by spiral shaped bacteria called spirochetes (also spelled spirocheates). Not all types of spriochete bacteria cause disease in humans, but many do. Syphilis, Lyme disease, bejel, yaws, pinta, leptospirosis, rat biting fever and relapsing fever are all caused by types of spirochete bacteria. Symptoms, diagnosis, and treatments are different for each disease. Even the way the infections are spread is different for each disease, for example Lymes disease is spread by deer ticks where as bejel, yaws and pinta are spread by close skin contact with an infected person. For more on any of the diseases caused by spirochetes, see Syphilis, Lyme disease, Bejel, Yaws, Pinta, Leptospirosis, Rat bite fever,
and Relapsing fever.