Journal Article

Surveillance for Influenza during the 2009 Influenza A (H1N1) Pandemic–United States, April 2009–March 2010

Lynnette Brammer, Lenee Blanton, Scott Epperson, Desiree Mustaquim, Amber Bishop, Krista Kniss, Rosaline Dhara, Mackenzie Nowell, Laurie Kamimoto and Lyn Finelli

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 52, issue suppl_1, pages S27-S35
Published in print January 2011 | ISSN: 1058-4838
Published online January 2011 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1093/cid/ciq009
Surveillance for Influenza during the 2009 Influenza A (H1N1) Pandemic–United States, April 2009–March 2010

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The emergence in April 2009 and subsequent spread of the 2009 pandemic influenza A (H1N1) virus resulted in the first pandemic of the 21st century. This historic event was associated with unusual patterns of influenza activity in terms of the timing and persons affected in the United States throughout the summer and fall months of 2009 and the winter of 2010. The US Influenza Surveillance System identified 2 distinct waves of pandemic influenza H1N1 activity—the first peaking in June 2009, followed by a second peak in October 2009. All influenza surveillance components showed levels of influenza activity above that typically seen during late summer and early fall. During this period, influenza activity reached its highest level during the week ending 24 October 2009. This report summarizes US influenza surveillance data from 12 April 2009 through 27 March 2010.

Journal Article.  5579 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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