2004, Number 1
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Rev Mex Patol Clin Med Lab 2004; 51 (1)
West Nile virus encephalitis: Epidemiology, ecology, diagnosis and prevention
Carrada BT
Language: Spanish
References: 51
Page: 6-15
PDF size: 446.53 Kb.
ABSTRACT
West Nile encephalitis is caused by West Nile virus, an arthropod-borne virus
which is spreading in Northamerica. In the summer 1999, crows deaths from New
York, sick birds at the Bronx zoo, and an unusual cluster of human
encephalitis cases heralded the arrival of this new
Flavivirus in
the United States. Although there were only 62 cases and seven deaths
in 1999, the virus has since moved across the continent, and
during 2002 there were 4156 cases and 284 deaths. Recent outbreaks were
also recorded at Israel, Romania, Russia and Canada. Elderly people and
those on immunosuppressive drugs are at special risk of neuroinfection,
in which the meninges, the brain parenchyma or the spinal cord were
damaged. During 2002, patients with polio-like flaccid paralysis were
also recognized. Attempts at virus isolation from serum or
cerebrospinal fluid were usually unsuccessful because viraemias were
low and the virus has cleared by the time most patients presented.
Immunoglubulin M antibody testing of serum specimens and cerebrospinal
fluid was the most practical and efficient method of diagnosis.
Prevention rest on elimination of mosquito breeding sites; judicious
use of pesticides; and avoidance of mosquito bites, including mosquito
repellent use. A review of the ecology-epidemiology and clinical
features of West Nile virus is presented in this paper.
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