Home > Centers for Disease Control and Prevention, diseases and conditions > West Nile Virus Disease and Other Arboviral Diseases — United States, 2011

West Nile Virus Disease and Other Arboviral Diseases — United States, 2011

July 13, 2012

West Nile Virus Disease and Other Arboviral Diseases — United States, 2011
Source: Morbidity and Mortality Weekly Report (CDC)

Arthropodborne viruses (arboviruses) are transmitted to humans primarily through the bites of infected mosquitoes and ticks. Symptomatic infections most often manifest as a systemic febrile illness and, less commonly, as neuroinvasive disease (e.g., meningitis, encephalitis, or acute flaccid paralysis). West Nile virus (WNV) is the leading cause of domestically acquired arboviral disease in the United States (1). However, several other arboviruses also cause seasonal outbreaks and sporadic cases (1). In 2011, CDC received reports of 871 cases of nationally notifiable arboviral diseases (excluding dengue); etiological agents included WNV (712 cases), La Crosse virus (LACV) (130), Powassan virus (POWV) (16), St. Louis encephalitis virus (SLEV) (six), Eastern equine encephalitis virus (EEEV) (four), and Jamestown Canyon virus (JCV) (three). Of these, 624 (72%) were classified as neuroinvasive disease, for a national incidence of 0.20 per 100,000 population. WNV and other arboviruses continue to cause focal outbreaks and severe illness in substantial numbers of persons in the United States.

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Categories: Centers for Disease Control and Prevention, diseases and conditions
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