| 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) |
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| 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) |
| rickettsiaceae | A family of small, gram-negative organisms often parasitic in man and other animals, causing diseases that may be transmitted by invertebrate vectors. (12 Dec 1998) |
| rickettsiaceae infections | Infections with bacteria of the family rickettsiaceae. (12 Dec 1998) |
| rickettsial | Pertaining to or caused by rickettsiae. (05 Mar 2000) |
| rickettsial diseases | The infectious diseases caused by the rickettsiae fall into 4 groups:(1) typhus: epidemic typhus, brill-zinsser disease, murine (endemic) typhus, and scrub typhus; (2) spotted fever rocky mountain spotted fever, eastern tick-borne rickettsioses, and rickettsialpox; (3) q fever; and (4) trench fever. (12 Dec 1998) |
| rickettsial vaccines | Vaccines for the prevention of diseases caused by various species of rickettsia. (12 Dec 1998) |
| rickettsiales | An order of gram-negative bacteria including many that may cause disease in man or in other vertebrate or invertebrate hosts. (12 Dec 1998) |
| rickettsiales infections | Infections with bacteria of the order rickettsiales. (12 Dec 1998) |
| rickettsialpox | A mild infectious disease first observed in new york city caused by rickettsia akari, transmitted from its mouse host by chigger or adult mite bites. There is fever, a dark spot that becomes a small ulcer at the site of the bite, swollen glands (lymphadenopathy) in that region, and a raised blistery (vesicular) rash. Also known as vesicular rickettsiosis. (12 Dec 1998) |
| rickettsias | Obligate intracellular parasites which cause a variety of disease, including typhus and Rocky Mountain spotted fever. (09 Oct 1997) |
| rickettsieae | A tribe of gram-negative bacteria of the family rickettsiaceae whose organisms are found in arthropods and are pathogenic for man and certain other vertebrate hosts. (12 Dec 1998) |
| rickettsioses | The infectious diseases caused by the rickettsiae. See rickettsial diseases. (12 Dec 1998) |
| rickettsioses of the eastern hemisphere, tick-borne | There are 3 known diseases caused by infection with rickettsial agents> They are north asian tick-borne rickettsiosis, queensland tick typhus, and african tick typhus (fi |