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Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
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 ]
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).
CNN: How common is West Nile? Wen: In the US this year, the CDC has documented 33 states that have had West Nile cases. In 2023, 47 states reported West Nile cases; in total, there were more than ...
Nationally, the incidence rate of neuroinvasive West Nile virus disease, meaning the infection affected the nervous system, was the highest since 2012 at 0.6 cases per 100,000 people, largely ...
In 2022, the county recorded one death and five cases, the data show. West Nile virus killed seven people last year across the four-county region of Sacramento, El Dorado, Placer and Yolo ...
West Nile virus (WNV) infection typically manifests with most individuals remaining asymptomatic, while approximately 20-40% of those infected develop symptoms ranging from mild flu-like illness to severe West Nile encephalitis. [9] The incidence of severe neurologic disease is less than 1%. [9]
Symptoms and risks of West Nile Virus. The U.S. has recorded 659 cases in 43 states so far this year, according to the CDC, though the agency warns that is likely an undercount.