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West Nile virus (WNV) is a single-stranded RNA virus that causes West Nile fever. It is a member of the family Flaviviridae , from the genus Flavivirus , which also contains the Zika virus , dengue virus , and yellow fever virus.
U.S. West Nile virus (WNV) neuroinvasive disease incidence as of Sep 4, 2012. The West Nile virus quickly spread across the United States after the first reported cases in Queens, New York, in 1999. The virus is believed to have entered in an infected bird or mosquito, although there is no clear evidence.
West Nile fever is an infection by the West Nile virus, which is typically spread by mosquitoes. [1] In about 80% of infections people have few or no symptoms . [ 2 ] About 20% of people develop a fever , headache, vomiting, or a rash. [ 1 ]
West Nile virus is the leading cause of mosquito-borne disease in the contiguous United States, according to the Centers for Disease Control and Prevention (CDC).
There have been 289 human West Nile virus disease cases in 2024, according to the CDC. Cases of the virus occur during mosquito season, which starts in the summer and continues through fall ...
Overall, the CDC has received reports of 289 West Nile cases in 33 states for 2024; 195 of those cases have been neuroinvasive, in which the virus invades the brain and nervous system. This can ...
"West Nile virus is the leading cause of mosquito-borne disease in the continental United States and cases are seen every year," Dr. Erin Staples, a medical epidemiologist with the CDC’s ...
[9] 17 people have either tested positive or are suspected of having the virus in Saskatchewan, and only one person has tested positive in Alberta. [10] Saskatchewan has reported 826 cases of WNV plus three deaths. [11] The spread of West Nile Virus infected mosquitoes to British Columbia for the first time was reported in 2009 [12]