| Rickettsia sennetsu | The species causing Sennetsu fever in humans. Synonym: Rickettsia sennetsu. (05 Mar 2000) |
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| 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 typhi | The aetiologic agent of murine typhus (see typhus, endemic flea-borne). (12 Dec 1998) |
| rickettsia vaccine | Attenuated See: typhus vaccine. (05 Mar 2000) |