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West Nile Virus

West Nile virus (WNV) is an infectious disease agent that first appeared in the United States in 1999. WNV can result in an asymptomatic infection, a mild or moderate flu-like illness, or neurological diseases such as encephalitis or meningitis. Approximately 80 percent of people who are infected with WNV will show no symptoms at all. Typically people develop symptoms 3 to 14 days after they have been bitten by an infected mosquito.

Infectious Diseases & Outbreaks Division, Field Surveillance Staff (FSS), investigate all reports of West Nile disease from notifiable disease reporters. ADPH displays the confirmed cases on the Alabama Morbidity Report, Arbovirals, and submits it to CDC's ArboNet for display by county, see West Nile Alabama Cases links below. Case counts are updated weekly.


  • The Centers for Disease Control and Prevention (CDC) laboratory will test for chikungunya if the criteria are met byboth the CDC and ADPH for specimen submission. Testing will not be initiated without the inclusion of all requested and completed documentation. Requests and test results may be delayed.
  • The only private lab in the U.S. performing chikungunya testing is Focus Diagnostics. Focus Diagnostics has accounts with most large reference labs (i.e. Quest, LabCorp, Mayo, ARUP) and many local hospitals. In order to receive more timely results, providers can submit their chikungunya test request to a reference laboratory that has an account with Focus Diagnostics.
  • If a healthcare provider suspects a patient to have chikungunya with recent travel history (Southern Florida, Caribbean, Africa, Asia, Europe, India, or Pacific Ocean) please review the ADPH Chikungunya Recommendations, including reporting, patient education, specimen collection, shipping, and resources.

Learn How To Reduce Your Exposure to Mosquitoes

West Nile Alabama Cases

For the General Public

For Healthcare Professionals

For Veterinarians

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