| rickettsia prowazekii | A species of gram-negative, aerobic bacteria that is the aetiologic agent of epidemic typhus fever acquired through contact with lice (typhus, epidemic louse-borne) as well as brill's disease. (12 Dec 1998) |
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| Rickettsia psittaci | Former name for Chlamydia psittaci. (05 Mar 2000) |
| rickettsia rickettsii | A species of gram-negative, aerobic bacteria that is the aetiologic agent of rocky mountain spotted fever. Its cells are slightly smaller and more uniform in size than those of rickettsia prowazekii. (12 Dec 1998) |
| Rickettsia ruminantium | Former name for Cowdria ruminantium. (05 Mar 2000) |
| Rickettsia sennetsu | The species causing Sennetsu fever in humans. Synonym: Rickettsia sennetsu. (05 Mar 2000) |
| Rickettsia sibirica | The agent of Siberian or North Asian tick typhus, transmitted by various ixodid ticks, which also serve as reservoirs, possibly aided by rodents and hares; the disease resembles Rocky Mountain spotted fever. (05 Mar 2000) |
| rickettsia tsutsugamushi | A species of gram-negative, aerobic bacteria that is the aetiologic agent of scrub typhus. Strains of this species vary considerably in antigenic composition and in some cases in virulence and other biological properties. (12 Dec 1998) |
| rickettsia typhi | The aetiologic agent of murine typhus (see typhus, endemic flea-borne). (12 Dec 1998) |
| rickettsia vaccine | Attenuated See: typhus vaccine. (05 Mar 2000) |