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  • West Nile Virus | CDC
    West Nile is the most common disease spread by mosquitoes in the contiguous U S
  • Data and Maps for West Nile | West Nile Virus | CDC
    West Nile virus disease (West Nile) is a nationally notifiable condition Cases are reported to CDC by state and territorial health departments using standard case definitions
  • About West Nile | West Nile Virus | CDC
    West Nile virus is the leading cause of mosquito-borne disease in the contiguous United States Each year, more than 1,300 people develop severe illness that affects the central nervous system and more than 130 people die
  • Symptoms, Diagnosis, and Treatment | West Nile Virus | CDC
    West Nile virus can result in mild illness with flu-like symptoms or severe illness that affects the central nervous system or results in hospitalization or death There is no treatment for West Nile virus disease (West Nile) Rest, fluids, and pain medications may relieve symptoms
  • Current Year Data (2025) | West Nile Virus | CDC
    West Nile virus case data for the U S are regularly updated in summer and fall
  • Site Index | West Nile Virus | CDC
    Browse the West Nile website by audience: everyone, health care providers, public health
  • Communication Resources | West Nile Virus | CDC
    A West Nile virus survivor describes his experience with severe illness and the importance of mosquito bite prevention CDC graphics and photos are available for download and use without copyright restrictions Fact sheets provide information about West Nile virus, mosquitoes, and mosquito control
  • West Nile Virus and Other Nationally Notifiable . . .
    The leading cause of arboviral disease in the United States is West Nile virus (WNV), which causes an average of 2,000 disease cases annually, including 1,200 life-threatening neurological illnesses and approximately 120 deaths (3) Other domestic arboviruses can cause sporadic cases and occasional outbreaks (3) Most infections are asymptomatic
  • Clinical Signs and Symptoms of West Nile Virus Disease
    West Nile virus (WNV) can cause an acute febrile illness or neurologic disease, including meningitis, encephalitis, and acute flaccid myelitis The incubation period ranges from 2–14 days but can be longer in immunocompromised persons The overall fatality in patients with WNV neuroinvasive disease is approximately 10% Long-term neurologic sequelae are common among survivors
  • Transmission of West Nile Virus | West Nile Virus | CDC
    West Nile virus disease is caused by virus in the genus Flavivirus West Nile virus is maintained in the environment by Culex species mosquitoes and avian hosts Humans are dead-end hosts but can rarely transmit the virus through blood transfusion, organ transplantation, perinatally, and breastfeeding





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