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Microbiology reagents intended to identify species of Rickettsia, a genus of gram-negative bacteria of the family Rickettsiaceae. Rickettsia bacteria that are pathologic to humans are usually divided into three groups on the basis of antigenic relationships. The typhus group includes the species R. typhi and R. prowazekii. Spotted-fever-group species, which cause several similar diseases widely distributed geographically (e.g., Rocky Mountain spotted fever, Kenya tick typhus, Siberian tick typhus), include R. rickettsii, R. conorii, and R. siberica. The group that causes scrub fever includes R. tsutsugamushi.
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