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Percentage of West Nile virus disease cases by week of illness onset, United States, 2009-2018

Incidence peaks in the late summer and early autumn. A total of 21,869 cases were reported in the United States from 2009 to 2018. (Source: 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(1):1-15.)

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  • Encephalitis
  • Meningitis
  • Meningoencephalitis
  • Poliomyelitis