| Omsk haemorrhagic fever | A form of epidemic haemorrhagic fever found in central Russia, caused by the Omsk haemorrhagic fever virus, a member of the family Flaviviridae, and transmitted by Dermacentor ticks; associated with gastrointestinal symptoms and haemorrhages but little or no central nervous system involvement. (05 Mar 2000) |
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| Omsk haemorrhagic fever virus | A virus of the genus Flavivirus causing Omsk haemorrhagic fever. (05 Mar 2000) |
| o'nyong-nyong fever | A dengue-like disease caused by the o'nyong-nyong virus, a member of the family Togaviridae, and transmitted by a mosquito, characterised by joint pains and notable lymphadenopathy followed by a maculopapular eruption of the face which extends to the trunk and extremities but fades in several days without desquamation. (05 Mar 2000) |
| Oroya fever | A generalised, acute, febrile, endemic, and systemic form of bartonellosis; marked by high fever, rheumatic pains, progressive, severe anaemia, and albuminuria. Synonym: Carrion's disease. (05 Mar 2000) |
| tertian fever | <disease, microbiology> A type of malaria caused by the protozoan Plasmodium vivax, it isthe most common form of the disease, is rarely fatal but is the most difficult to cure, and is characterised by fevers that typically occur every other day. (11 Nov 1997) |
| Texas fever | An infectious disease of cattle caused by Babesia species and transmitted by ticks. Synonym: bovine haemoglobinuria, redwater fever, Texas fever, tick fever. (05 Mar 2000) |
| therapeutic fever | Treatment of disease by inducing an artificial fever in the patient. Synonym: therapeutic fever. (05 Mar 2000) |
| thermic fever | A severe and often fatal illness produced by exposure to excessively high temperatures, especially when accompanied by marked exertion. It can manifest by elevated body temperature, lack of sweating, hot dry skin, and neurologic symptoms; unconsciousness, paralysis, headache, vertigo, confusion. In severe cases very high fever, vascular collapse, and coma develop. Synonym: heat apoplexy, heat hyperpyrexia, malignant hyperpyrexia, thermic fever. (05 Mar 2000) |
| thirst fever | An elevation of temperature in infants after reduction of fluid intake, diarrhoea, or vomiting; probably caused by reduced available body water, with reduced heat loss by evaporation; an analogous condition in adults is seen when exertion is continued in the face of dehydration. Synonym: dehydration fever, exsiccation fever, inanition fever. (05 Mar 2000) |
| East Coast fever | A serious disease of cattle in eastern and central Africa, caused by the protozoan Theileria parva and characterised by high fever, swelling of the lymph nodes, and high case fatality; transmitted by Rhipicephalus appendiculatus and other ticks of the genus Rhipicephalus. (05 Mar 2000) |
| ebola haemorrhagic fever | An epidemic viral illness seen in southern Sudan and Zaire, caused by the Ebola virus. The illness is characterised by fever, malaise, muscle aches, respiratory symptoms, diarrhoea, vomiting, epistaxis, haemoptysis, haematemesis, rash, tremors and subconjunctival haemorrhages. Transmitted by close bodily contact with infected individuals (blood, faeces and body fluids). Incubation is-21 days with initial symptoms of fever and headache. There is no specific treatment and death can occur within 10 days. (27 Sep 1997) |
| three-day fever | Influenza-like febrile viral disease caused by several members of the bunyaviridae family and transmitted mostly by the bloodsucking sandfly phlebotomus papatasii. (12 Dec 1998) |
| tick-borne fever | A rickettsial disease of ruminants transmitted by the tick Ixodes ricinus in Europe and Rhipicephalus haemaphysaloides supina in India and characterised by pyrexia, depression, and anorexia. (05 Mar 2000) |
| tick fever | <infectious disease> An acute febrile (feverish) disease initially recognised in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in the Western Hemisphere. The disease is characterised by sudden onset of headache, chills and fever which can persist for 2-3 weeks, muscle pain. A characteristic rash appears on the extremities and trunk about the 4th day of illness. The rickettsiae grow within damaged cells lining blood vessels which may become blocked by clots. Blood vessel inflammation (vasculitis) is widespread Early recognition of the condition and prompt antibiotic treatment is important in reducing mortality. Synonym: spotted fever, tick fever, and tick typhus. (25 Jun 1999) |
| Tobia fever | <infectious disease> An acute febrile (feverish) disease initially recognised in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in the Western Hemisphere. The disease is characterised by sudden onset of headache, chills and fever which can persist for 2-3 weeks, muscle pain. A characteristic rash appears on the extremities and trunk about the 4th day of illness. The rickettsiae grow within damaged cells lining blood vessels which may become blocked by clots. Blood vessel inflammation (vasculitis) is widespread Early recognition of the condition and prompt antibiotic treatment is important in reducing mortality. Synonym: spotted fever, tick fever, and tick typhus. (25 Jun 1999) |