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The North American strains appear to be monotypic with a mutation rate of 2.7 × 10 −4 substitutions/site/year (s/s/y). It appears to have diverged from the other strains 922 to 4,856 years ago. The other strains are divided into two main clades and a third smaller one. The two main clades diverged between 577 and 2,927 years ago.
About 2 in 10 people infected with West Nile virus develop symptoms, which can include fever and swelling of the brain. About 1 in 10 people who develop severe symptoms die. There have been 216 ...
Individuals can also experience long-term neurological consequences as a result of contracting West Nile. West Nile virus is most commonly spread through the bite of an infected mosquito. - Jon ...
There also are no vaccines available for West Nile or EEE.However, a dengue vaccine is available in the U.S. and is FDA approved for children between ages 9 and 16 who have a laboratory-confirmed ...
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 ]
Unlike Eastern equine encephalitis, the overall mortality of WEE is low (approximately 4%) and is associated mostly with infection in the elderly. Approximately 15–20% of horses that acquire the virus will die or be put down. [3] There is no human vaccine for WEE and there are no licensed therapeutic drugs in the U.S. for this infection.
A primary focus must be on the development of vaccines, given the severe long-term effects and health threats posed by WNV. Research efforts should aim to create vaccines that not only provide robust immunity against WNV but also address the unique challenges posed by the virus, such as its ability to cause neurological complications. [ 1 ]
There have been 29 human cases of West Nile Virus confirmed in 2024, state officials said in a weekly update. Tuscola County horse euthanized after West Nile Virus diagnosis. Here's how many cases ...