<unk>  is a bacterial species of the spirochete class in the genus<unk> , and is one of the causative agents of Lyme disease in humans. Along with a few similar genospecies, some of which also cause Lyme disease, it makes up the species complex of<unk>  sensu lato. The complex currently comprises 20 accepted and 3 proposed genospecies.<unk>  sensu stricto exists in North America and Eurasia and until 2016 was the only known cause of Lyme disease in North America.<unk>  species are Gram-negative.
Borrelia burgdorferi
Rickettsia rickettsii
Arthritis mutilans
Psoriatic arthritis
Plasmodium chabaudi
Treponema pallidum
Plasmodium unalis
Reactive arthritis