<unk>  is a species of Borrelia, a spirochaete bacterium associated with relapsing fever. B.<unk>  is usually transmitted from person to person by the human body louse. Since the 1800s, the body louse has been known as its only known vector.
B.<unk>  DNA was found in 23% of head lice from patients with louse-borne relapsing fever in Ethiopia. Whether head lice can transmit these bacteria from one person to another remains to be determined. 
It is notable for its ability to alter the proteins expressed on its surface. This is what causes the "relapsing" characteristic of relapsing fever.
Borrelia recurrentis
Borrelia afzelii
Borrelia mayonii
Herpes gladiatorum
Herpes simplex
Brugia timori
Borrelia burgdorferi
Pygeum africanum