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  • Current Year Data (2025) | West Nile Virus | CDC - Centers for Disease . . .
    Current season data are updated every one to two weeks during June through December Due to delays in reporting, state, territorial, and local health departments may have more up-to-date information than what is presented here View the data for West Nile Data are current as of June 17, 2025
  • West Nile Virus | West Nile Virus | CDC - Centers for Disease Control . . .
    West Nile virus is primarily spread by mosquitoes Learn about areas at risk, the illness it causes, and ways to prevent becoming infected View All For Everyone About Causes and Spread Prevention Data and Maps for West Nile Illness Info Health Care Providers Clinical Signs and Symptoms
  • Data and Maps for West Nile | West Nile Virus | CDC
    West Nile virus activity typically occurs during the summer months and into the fall The annual number of reported West Nile cases can fluctuate widely, as a result of periodic epidemics All residents of and visitors to areas where virus activity has been identified are at risk for infection, particularly people who work or participate in
  • About West Nile | West Nile Virus | CDC - Centers for Disease Control . . .
    West Nile virus is the leading cause of mosquito-borne disease in the continental United States It is most commonly spread to people by the bite of an infected mosquito Cases of West Nile occur during mosquito season, which starts in the summer and continues through fall There are no vaccines to prevent or medicines to treat West Nile in people
  • West Nile: Symptoms, Diagnosis, Treatment | West Nile Virus - CDC
    West Nile virus can result in febrile illness or neurologic disease, including meningitis or encephalitis If you think you or a family member might have West Nile virus disease (West Nile), talk with your health care provider There is no specific treatment for West Nile Rest, fluids, and pain medications may relieve symptoms
  • Guidelines for West Nile Virus Surveillance and Control
    West Nile virus (WNV), a mosquito-transmitted member of the genus Flavivirus is the most frequent cause of arboviral disease in the continental United States and is recognized as the most widely distributed arbovirus in the world (Kramer et al 2008) First identified in northwest Uganda in 1937 (Smithburn et al 1940), WNV was not viewed as a public health threat until it was associated with
  • West Nile Virus Surveillance and Control Guidelines
    West Nile virus (WNV), a mosquito-transmitted member of the genus Flavivirus, is the most frequent cause of arboviral disease in the continental United States and is recognized as the most widely distributed arbovirus in the world (Kramer et al 2008) First identified in northwest Uganda in 1937 (Smithburn et al 1940), WNV was not viewed as a
  • West Nile Virus and Other Nationally Notifiable Arboviral Diseases . . .
    West Nile virus is the leading cause of arboviral disease in the continental United States although 39% of cases occurred during October–December (Table 1) All late-season cases were reported in the southwestern United States (Arizona, California, and Texas) Median patient age was 65 years, and 61% of patients were male Twenty-seven
  • West Nile Virus - CDC Stacks
    Current season data are updated every one to two weeks during June through December Due to delays in reporting, state, territorial, and local health departments may have more up-to-date information West Nile virus human disease cases reported by state of residence, 2024 West Nile Virus Download Data (CSV) 1 to 5 6 to 8 9 to 25 >25
  • Transmission of Japanese Encephalitis Virus
    Japanese encephalitis (JE) virus is a mosquito-borne flavivirus, similar to West Nile virus or St Louis encephalitis virus The virus is maintained in a cycle between mosquitoes and vertebrate hosts, primarily pigs and wading birds In the subtropics and tropics, transmission can occur year-round, often with a peak during the rainy season





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