Gram negative obligate intracellular coccobacillus. Orientia tsutsugamushi and Orientia chuto (PubMed). Many strains/serotypes. In its own genus. Diagnose with serology.
Found in South Pacific, Asia, Australia it is spread by a mite from wild rodents. In 2016 it made it to Chiloé Island in southern Chile (which may be a unique organism (PubMed). Orientia chuto in Dubai.
Spread by Leptotrombidium mites (aka chigger) bite, which are both the vector and reservoir. 6-10 day incubation.
Scrub typhus: Fever, severe headache, and myalgia; often with tender lymphadenopathy in the region of the bite followed in 5 days by rash that goes from extremities to central.
Due to great antigenic variability, infection does not confer resistance to other strains.
I just love to say the word "tsutusgamushi"; do not ask me why.
From Japanese tsutsuga "illness" and mushi "insect".
It was a problem in the Pacific theater in WW2 (Review)
Last update: 05/05/18