Prevalence of rickettsia-like organisms and spotted fever group rickettsiae in ticks (Acari: Ixodidae) from Zimbabwe. 1995

L Beati, and P J Kelly, and L A Matthewman, and P R Mason, and D Raoult
Unité des Rickettsies, Faculté de Médecine, Marseille, France.

The prevalence of rickettsia-like organisms in ticks from Zimbabwe was determined using the hemolymph test. Amblyomma hebraeum had the highest prevalence of rickettsia-like organisms. Other species with rickettsia-like organisms included Amblyomma sparsum, Amblyomma variegatum, Hyalomma marginatum rufipes, Ripicephalus simus, Haemaphysalis leachi, Amblyomma rhinocerotis, and Hyalomma truncatum. Ticks with no demonstrable rickettsia-like organisms infection were Boophilus decoloratus, Haemaphysalis spinulosa, Rhipicephalus appendiculatus, Rhipicephalus evertsi evertsi, and Rhipicephalus sanguineus. Polymerase chain reaction followed by restriction fragment-length polymorphism analysis on samples of hemolymph-positive ticks showed the agent of African tick-bite fever to be present in A. hebraeum, Rickettsia conorii to be present in Rhipicephalus simus and Haemaphysalis leachi, and a spotted fever group rickettsia similar to that in Hyalomma marginatum marginatum ticks from Morocco and Portugal to be present in Hyalomma marginatum rufipes.

UI MeSH Term Description Entries
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012281 Rickettsia A genus of gram-negative, aerobic, rod-shaped bacteria often surrounded by a protein microcapsular layer and slime layer. The natural cycle of its organisms generally involves a vertebrate and an invertebrate host. Species of the genus are the etiological agents of human diseases, such as typhus.
D012287 Rickettsiaceae A family of gram-negative bacteria belonging to the order Rickettsiales.
D012373 Rocky Mountain Spotted Fever An acute febrile illness caused by RICKETTSIA RICKETTSII. It is transmitted to humans by bites of infected ticks and occurs only in North and South America. Characteristics include a sudden onset with headache and chills and fever lasting about two to three weeks. A cutaneous rash commonly appears on the extremities and trunk about the fourth day of illness. Sao Paulo Typhus,Typhus, Sao Paulo,Brazilian Spotted Fever,Rickettsia rickettsii Infection,Fever, Brazilian Spotted,Infection, Rickettsia rickettsii,Rickettsia rickettsii Infections,Spotted Fever, Brazilian
D013987 Ticks Blood-sucking acarid parasites of the order Ixodida comprising two families: the softbacked ticks (ARGASIDAE) and hardbacked ticks (IXODIDAE). Ticks are larger than their relatives, the MITES. They penetrate the skin of their host by means of highly specialized, hooked mouth parts and feed on its blood. Ticks attack all groups of terrestrial vertebrates. In humans they are responsible for many TICK-BORNE DISEASES, including the transmission of ROCKY MOUNTAIN SPOTTED FEVER; TULAREMIA; BABESIOSIS; AFRICAN SWINE FEVER; and RELAPSING FEVER. (From Barnes, Invertebrate Zoology, 5th ed, pp543-44) Ixodida,Ixodidas,Tick
D015030 Zimbabwe A republic in southern Africa, east of ZAMBIA and BOTSWANA and west of MOZAMBIQUE. Its capital is Harare. It was formerly called Rhodesia and Southern Rhodesia. Rhodesia, Southern,Southern Rhodesia,Republic of Zimbabwe,Zimbabwe Rhodesia
D015995 Prevalence The total number of cases of a given disease in a specified population at a designated time. It is differentiated from INCIDENCE, which refers to the number of new cases in the population at a given time. Period Prevalence,Point Prevalence,Period Prevalences,Point Prevalences,Prevalence, Period,Prevalence, Point,Prevalences
D018884 Ixodes The largest genus of TICKS in the family IXODIDAE, containing over 200 species. Many infest humans and other mammals and several are vectors of diseases such as LYME DISEASE; ENCEPHALITIS, TICK-BORNE; and KYASANUR FOREST DISEASE. Black-legged Tick,Blacklegged Tick,California Black Legged Tick,Castor Bean Tick,Deer Tick,Ixodes dammini,Ixodes pacificus,Ixodes persulcatus,Ixodes ricinus,Ixodes scapularis,Western Black Legged Tick,Western Blacklegged Tick,Black legged Tick,Black-legged Ticks,Blacklegged Tick, Western,Blacklegged Ticks,Castor Bean Ticks,Deer Ticks,Ixodes damminus,Ixodes scapulari,Tick, Black-legged,Tick, Blacklegged,Tick, Castor Bean,Tick, Deer,Tick, Western Blacklegged,Western Blacklegged Ticks

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