Abstract Problem/Condition:West Nile virus (WNV) is an arthropodborne virus (arbovirus) in the family Flaviviridae and is the leading cause of domestically acquired arboviral disease in the contiguous United States. An estimated 70%–80% of WNV infections are asymptomatic. Symptomatic persons usually develop an acute systemic febrile illness. Less than 1% of infected persons develop neuroinvasive disease, which typically presents as encephalitis, meningitis, or acute flaccid paralysis.


Original Title: 12267-WNV-tif.tif

Read more CDC…

Citation: McDonald E, Mathis S, Martin SW, Staples JE, Fischer M, Lindsey NP. Surveillance for West Nile Virus Disease — United States, 2009–2018. MMWR Surveill Summ 2021;70(No. SS-1):1–15. DOI: http://dx.doi.org/10.15585/mmwr.ss7001a1external icon.