2011-2012 influenza season surveillance summary
Corporate Authors:National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.
Series:FluView : 2011-2012 Influenza Season ; 2011-2012 influenza season surveillance summary
Description:During the 2011-2012 influenza season (October 2, 2011 to September 29, 2012), influenza activity
first began to increase in the southern and southeastern states in November, and peaked nationally
in late February and early March. Compared with the previous season (2010-11), there were lower
rates of hospitalization observed in all age groups, and the percentage of outpatient visits for
influenza-like illness (ILI) was lower than during the 2010-11 influenza season. Nationally, influenza
A (H3) was the predominant virus throughout the season, although influenza A 2009 H1N1 and
influenza B also circulated. The predominant virus varied by U.S. Department of Health and
Human Service (HHS) region and also by week.
Publication date from document properties.
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