Centers for Disease Control and Prevention (CDC). Assessment of the effectiveness of the 2003-04 influenza vaccine among children and adults--Colorado, 2003. MMWR Morb Mortal Wkly Rep. 2004 Aug 13;53(31):707-10
Centers for Disease Control and Prevention (CDC).
The 2003-04 influenza season was characterized by the early onset of influenza activity, reports of severe illness, particularly in children, and predominant circulation of an influenza A (H3N2) virus strain that was antigenically different from the influenza A (H3N2) vaccine strain. In 2003, a retrospective cohort study among children and a case-control study among adults in Colorado were conducted to provide preliminary data on the effectiveness of the 2003-04 influenza vaccine. This report summarizes the results of those studies, which indicated vaccine effectiveness (VE) among both adults and children, differing from results of a previous study that did not indicate effectiveness among adults.
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