Seasonal flu activity low in the United States so far

Seasonal Flu Activity Low in the United States So Far
Seasonal Flu Activity Low in the United States So Far

THURSDAY, Dec. 8 (HealthDay News) -- U.S. influenza incidence has been low for the first part of the season, the CDC announced recently in Morbidity & Mortality Weekly Report.

Lynnette Brammer, MPH, of the CDC in Atlanta, and colleagues collected data on 24,027 respiratory specimens from collaborating U.S. laboratories to provide a summary and update of U.S. influenza activity since Oct. 2, 2011.

The researchers found 266 specimens (1.1%) positive for influenza, of which 191 (71.8%) were influenza A and 75 (28.2%) were influenza B. The vast majority of influenza A viruses were H3 viruses -- 90.8%. Thirty states in the 10 U.S. Department of Health and Human Services regions reported influenza virus, with most reports originating in the southeastern states.

"During Oct. 2 to Nov. 26, 2011, influenza activity remained low in the United States. Thus far, influenza A viruses have predominated, and the majority are antigenically related to the 2011-2012 influenza vaccine strains for the Northern Hemisphere," the researchers wrote.

CDC. Morbidity and Mortality Weekly Report. 2011;60(48);1646-1649.

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