Borrelia miyamotoi is a spirochete bacterium in the genus "Borrelia". Other spirochete illnesses (Lyme disease, syphilis, leptospirosis) do not show spirochetes on blood smear. Borrelia is a genus of bacteria of the spirochete phylum. Borrelia mayonii is a Gram-negative, host-associated spirochete that is capable of causing Lyme disease. Treponema denticola is a Gram-negative, obligate anaerobic, motile and highly proteolytic spirochete bacterium. "Borrelia" species are members of the family Spirochaetaceae, so present the characteristic spirochete (spiral) shape. This exposure in particular is caused by the spirochete, Treponema pallidum. The causative organisms are mostly anaerobic bacteria, particularly Fusobacteria and spirochete species. Leptospira interrogans is a Gram negative, obligate aerobe spirochete, with periplasmic flagella. Leptospira kirschneri is a Gram negative, obligate aerobe species of spirochete bacteria. Human intestinal spirochetosis is an infection of the colonic-type mucosa with spirochete microorganisms. Bacterial, viral, and spirochete infections all have been associated with inflammatory neural responses. Lyme spirochete DNA has been found in semen and breast milk. Treponema carateum is a species of spirochete bacteria in the genus "Treponema". The Leptospiraceae are a family of spirochete bacteria.