Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由不同的发疹伤寒病原体（可由壁虱，蚤，虱子等寄生虫传播）引起的疾病称为斑疹伤寒。