Assessment of the effectiveness of the 2003-04 influenza vaccine among children and adults--Colorado, 2003.
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.
D016022:Case-Control Studies; D015331:Cohort Studies; D003120:Colorado / Q000453:epidemiology; D005260:Female; D006801:Humans; D007223:Infant; D007252:Influenza Vaccines / Q000008:administration & dosage* / Q000276:immunology; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012621:Seasons; D014611:Vaccination / Q000706:statistics & numerical data*
D007252:Influenza Vaccines