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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 virus is now endemic in Africa, Europe, the Middle East, west and central Asia, Oceania (subtype Kunjin), and most recently, North America and is spreading into Central and South America. [95] Outbreaks of West Nile virus encephalitis in humans have occurred in Algeria (1994), Romania (1996 to 1997), the Czech Republic (1997), Congo ...
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 ...
West Nile virus (WNV) is a mosquito-borne virus first identified in the United States in 1999. It is most commonly found in Africa, Europe, the Middle East and North America.
West Nile virus. West Nile fever is an infection by the West Nile virus, which is typically spread by mosquitoes. [53] In about 80% of infections people have few or no symptoms. [54] About 20% of people develop a fever, headache, vomiting, or a rash. [53]
Late summer is peak mosquito season. Exactly 25 years ago, West Nile first appeared in the Western Hemisphere in New York City before it spread across North America.
Warming global temperatures due to climate change have increased human exposure to West Nile virus, since mosquitoes are able to breed faster, bite more and survive for longer periods.
The first cases of West Nile disease in the United States occurred in 1999 in New York. In the first three years only a small number of human cases were diagnosed, all in the Eastern or Southern U.S. (149 cases and 19 deaths, 1999–2001).