The Rickettsia pathogens are a genus of parasites that use rodents as hosts. Multiple species have been recorded, each associated with a different type of Typhus Fever. One such species is Rickettsia tsutsugamushi, also called Scrub Typhus due to their presence being largely in shrub forests. The symptoms of Typhus Fever include muscle ache, headache, abdominal pain and most prominently, a fever. Scrub Typhus can be diagnosed through two tests to confirm their presence: the Weil Felix test and the IgM ELISA test. Both of these require a blood sample.