CDC: Neuroinvasive Arboviral Disease Incidence Studied

West Nile Virus was the most common cause of neuroinvasive arboviral disease in 2010

THURSDAY, Aug. 4 (HealthDay News) -- West Nile Virus (WNV) was the most common cause of neuroinvasive arboviral diseases in the United States in 2010, with La Crosse virus the most common cause of disease among children, according to a report in the Aug. 5 issue of the U.S. Centers for Disease Control and Prevention's Morbidity and Mortality Weekly Report.

The CDC evaluated surveillance data sent to the agency in 2010 for WNV and other nationally notifiable arboviruses, excluding dengue. In 2010, the report revealed that 40 states and the District of Columbia (DC) reported 1,021 cases of WNV disease, with 629 (62 percent) classified as WNV neuroinvasive disease, representing a national incidence of 0.20 per 100,000 population.

Arizona (1.60), New Mexico (1.03), Nebraska (0.55), and Colorado (0.51) had the highest incidence of WNV disease in 2010. California serogroup viruses (68 cases) were the next most commonly reported cause of neuroinvasive arboviral disease, followed by eastern equine encephalitis virus (10 cases), St. Louis encephalitis virus (eight cases), and Powassan virus (eight cases). Despite rarely occurring, eastern equine encephalitis was the most severe arboviral disease, with a 50 percent case-fatality rate in 2010. Eighty eight percent of arboviral disease occurred between July and September in 2010.

"WNV and other arboviruses continue to cause focal outbreaks and severe illness in substantial numbers of persons in the United States," the authors write. "Maintaining surveillance remains important to guide arboviral disease prevention activities."

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