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Arboviruses Continue to Cause Serious Illness — Physician’s First Watch

Medical News |
June 20, 2014

Arboviruses Continue to Cause Serious Illness

By Cara Adler

Edited by André Sofair, MD, MPH, and William E. Chavey, MD, MS

A total of 2605 cases of arboviral disease — 53% of which were neuroinvasive — were reported to the CDC in 2013, according to an analysis of national surveillance data in MMWR.

Most cases (95%) were caused by West Nile Virus. Of these patients, 61% were hospitalized and 5% died.

Other causes included La Crosse virus (85 cases), which was the leading cause of neuroinvasive disease in children, and eastern equine encephalitis (8), which had the highest fatality rate (50%). Rounding out the list were Jamestown Canyon virus (22), Powassan virus (15), unspecified California serogroup virus (5), and St. Louis encephalitis virus (1). Cases were reported in all states except Washington, Hawaii, and Alaska.

The incidence of WNV was less than half that in 2012, and higher than that in 2008 to 2011.

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