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Encyclopedia > Murray Valley encephalitis virus
Murray Valley encephalitis virus
Virus classification
Group: Group IV ((+)ssRNA)
Family: Flaviviridae
Genus: Flavivirus
Species: Murray Valley encephalitis virus

Murray Valley encephalitis virus (MVEV) is a flavivirus endemic to northern Australia and Papua New Guinea. It is the causal agent of Murray Valley encephalitis (previously known as Australian encephalitis) and in humans can cause permanent neurological disease or death. MVEV is related to Kunjin virus which has a similar ecology but has a lower morbidity rate. Viruses can be classified in several ways, such as by their geometry, by whether they have envelopes, by the identity of the host organism they can infect, by mode of transmission, or by the type of disease they cause. ... An RNA virus is a virus that either uses RNA as its genetic material, or whose genetic material passes through an RNA intermediate during replication. ... Genera Flavivirus Pestivirus Hepacivirus The Flaviviridae are a family of viruses that infect mammals. ... Species see text Flavivirus (also Japanese Encephalitis Antigenic Complex) is a genus of the family Flaviviridae. ... Species see text Flavivirus (also Japanese Encephalitis Antigenic Complex) is a genus of the family Flaviviridae. ...

MVEV is a mosquito-borne virus that is maintained in a bird-mosquito-bird cycle. Water birds from the Ciconiiformes order, including herons and cormorants, provide the natural reservoir for MVEV. The major mosquito vector is Culex annulirostris. Human infection occurs through bites from infected mosquitoes. An Arbovirus (short for Arthropod borne virus) is a virus that is primarily transmitted by arthropods, such as ticks and mosquitoes. ... Families Ardeidae Cochlearidae Balaenicipitidae Scopidae Ciconiidae Threskiornithidae Traditionally, the order Ciconiiformes has included a variety of large, long-legged wading birds with large bills: storks, herons, egrets, ibises, spoonbills, and several others. ... Genera Ardea Zebrilus Philherodias Tigrisoma Ardeola Bubulcus Egretta Agamia Butorides Tigriornis Tigrisoma Gorsachius Syrigma Zonerodius Nycticorax see also: Bittern Heron and reeds, Haronobu Suzuki (1754-1770) Herons are medium to large long-legged, long-necked wading birds of the family Ardeidae, which also includes the egrets and bitterns. ... Genera Nannopterum Phalacrocorax Leucocarbo The Phalacrocoracidae family of birds is represented by over thirty species of cormorants and shags. ... This article is about the insect; for the WWII aircraft see De Havilland Mosquito. ...

The first epidemics of MVE occurred in 1917 and 1918 in Southeastern Australia following years of high rainfall. The virus was isolated from human samples in 1951 during an epidemic.

The major clinical feature of MVEV is fever. Other symptoms may include seizures, nausea and diarrhoea in children and headaches, lethargy and confusion in adults. MVEV infection is usually subclinical with as few as 1 in 1000 incidents causing illness, most of them in children. Of infections that result in illness, mortality rate is estimated at 20%. Permanent neurological damage occurs in 50% of survivors.

  Results from FactBites:
Bad Skeeter West Nile Virus (735 words)
Arboviral encephalitis is an infectious disease that affects the brain.
Encephalitis arboviruses belong to several families of viruses that usually infect birds and are transmitted from bird to bird by mosquitoes.
West Nile virus is closely related to St. Louis encephalitis virus, which is found in the United States, the Japanese Encephalitis virus from Asia, and Murray Valley encephalitis virus from Australia and New Guinea.
  More results at FactBites »



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