| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
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| Rh | F rheumatic fever |
| RMSF | Rocky Mountain spotted fever |
| RVF | renal vascular failure; Rift Valley fever; right ventricular failure; right visual field |
| SFV | Semliki Forest virus; shipping fever virus; Shope fibroma virus; squirrel fibroma virus |
| Crimean-Congo haemorrhagic fever virus | A virus of the genus Nairovirus (family Bunyaviridae) from Africa and the southern USSR, carried by ticks (Hyalomma and Amblyomma) and found in human blood; the cause of Crimean-Congo haemorrhagic fever. (05 Mar 2000) |
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| Crimean fever | A febrile disease of the mediterranean area, the crimea, africa, and india, caused by infection with rickettsia conorii. (12 Dec 1998) |
| haematuric bilious fever | Haematuria due to renal lesions caused by the malarial haematozoon, Plasmodium falciparum. (05 Mar 2000) |
| haemoglobinuric fever | A condition, now uncommon, resulting from Plasmodium falciparum infection (malignant tertian malaria with severe haemolysis); frequently seen in Caucasians after interrupted treatment with quinine. Synonym: blackwater fever, haemoglobinuric fever, West African fever. (05 Mar 2000) |
| haemorrhagic fever | A syndrome that occurs in perhaps 20-40% of infections by a number of different viruses of the families Arenaviridae (Lassa fever, Bolivian haemorrhagic fever, Argentinean haemorrhagic fever), Bunyaviridae (Crimean-Congo haemorrhagic fever), Flaviviridae (Dengue haemorrhagic fever, Omsk haemorrhagic fever), Filoviridae (Ebola fever, Marburg virus disease), etc. Some types of haemorrhagic fever are tick-borne, others mosquito-borne, and some seem to be zoonoses; clinical manifestations are high fever, scattered petechiae, gastrointestinal tract and other organ bleeding, hypotension, and shock; kidney damage may be severe, especially in Korean haemorrhagic fever and neurologic signs may appear, especially in the Argentinean-Bolivian types. Five types of haemorrhagic fever are transmissible person-to-person: Bolivian haemorrhagic fever, Lassa fever, Ebola fever, Marburg virus disease, and Crimean-Congo haemorrhagic fever. See: epidemic haemorrhagic fever. Synonym: Ebola haemorrhagic fever. (05 Mar 2000) |
| haemorrhagic fever, american | Diseases caused by american haemorrhagic fever viruses (tacaribe complex viruses). (12 Dec 1998) |
| haemorrhagic fever, crimean | A severe, often fatal disease in humans caused by the crimean-congo haemorrhagic fever virus (haemorrhagic fever virus, crimean-congo). (12 Dec 1998) |
| haemorrhagic fever, ebola | A highly fatal, acute haemorrhagic fever, clinically very similar to marburg virus disease, caused by the ebola virus, first occurring in the sudan and adjacent northwestern (what was then) zaire. The natural reservoir and mode of transmission of the virus are unknown, but secondary infection is by direct contact with infected blood and other body secretions. (12 Dec 1998) |
| haemorrhagic fever, omsk | Infection with the omsk haemorrhagic fever virus, a flavivirus. (12 Dec 1998) |
| haemorrhagic fever virus | <virology> Any of many viruses in the families Flaviviridae, Filoviridae and Bunyaviridae that are often spread by rodents and biting insects, these viruses cause diseasescharacterised by fever and bleeding (such as Ebola). (09 Oct 1997) |
| haemorrhagic fever virus, crimean-congo | The type species of nairovirus of the family bunyaviridae isolated from febrile patients in africa. It is primarily transmitted by ticks and causes a severe, often fatal disease in humans. (12 Dec 1998) |
| haemorrhagic fever with renal syndrome | <syndrome> An acute febrile disease occurring predominately in asia. It is characterised by fever, prostration, vomiting, haemorrhagic phenonema, shock, and renal failure. It is caused by any one of several closely related species of the genus hantavirus. The most severe form is caused by hantaan virus whose natural host is the rodent apodemus agrarius. A milder form is caused by seoul virus and related species and transmitted by the rodents rattus rattus and r. Norvegicus. (12 Dec 1998) |
| Potomac horse fever | <veterinary> A febrile disease of horses in North America caused by Ehrlichia risticii and characterised by anorexia, leukopenia, and occasional diarrhoea. Synonym: Potomac horse fever. (05 Mar 2000) |
| Haverhill fever | <microbiology> An infection by Streptobacillus moniliformis marked by initial chills and high fever (gradually subsiding), by arthritis usually in the larger joints and spine, and by a rash occurring chiefly over the joints and on the extensor surfaces of the extremities. Haverhill fever is used to indicate Streptobacillus moniliformis infections not associated with rat bite resulting from contaminated food or water. Synonym: erythema arthriticum epidemicum. Origin: Haverhill, MA, where an epidemic occurred in 1926 (05 Mar 2000) |
| hay fever | <chest medicine> An inflammatory response in the nasal passages to an allergic stimulus. Often includes: nasal congestion, sneezing, runny or itchy nose. (27 Sep 1997) |