One species is Orientia tsutsugamushi, which causes scrub typhus in humans.

'Scrub typhus' is a form of typhus caused by 'Orientia tsutsugamushi'.

However, scrub typhus is still considered a rickettsiosis, even though the causative organism has been reclassified from Rickettsia tsutsugamushi to Orientia tsutsugamushi.

Scrub typhus or Bush typhus is a form of typhus caused by the intracellular parasite Orientia tsutsugamushi, a Gram-negative α-proteobacterium of family Rickettsiaceae first isolated and identified in 1930 in Japan.