West Nile fever is a sporadic disease of different bird species, horse, occasionally small rodents and humans, caused by flavivirus, spread and maintained by mosquitoes and other blood-sucking insects. The disease is endemic in Africa and some parts of Asia but in the last years it occurred in Europe and in the Western hemisphere. The vectors infect the different bird species by blood sucking, in which the virus multiplies and migrating birds also take part in spreading the virus over long distances. Birds, according to their susceptibility, show general clinical signs and die or survive. Horses, humans and other mammals are infected also by insect-bites and in horses encephalitis develops, fever, ataxia, hypersensitivity and paralysis occur. In humans usually there are mild influenza-like signs with fever but in certain cases meningitis and meningoencephalitis may develop. In the prevention of disease in humans, killing of mosquitoes is vital and for horses and birds vaccine containing genetically modified virus strains or inactivated viruses were produced.
|Number of pages||7|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Dec 1 2003|
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