CDC - Seasonal Influenza (Flu) - Final Season Vaccination Estimates: United States, 2009-10 Influenza Season

Final Estimates for 2009–10 Seasonal Influenza and Influenza A (H1N1) 2009 Monovalent Vaccination Coverage – United States, August 2009 through May, 2010.

Because the novel influenza A (H1N1) virus [2009 influenza A (H1N1)] was identified in April 2009, two separate influenza vaccines were distributed in the United States in 2009–2010: a seasonal vaccine and an influenza A (H1N1) 2009 monovalent vaccine (2009 H1N1 vaccine) [1, 2]. To estimate national and state level influenza vaccination coverage from August 2009 – May 2010, CDC used combined data from the Behavioral Risk Factor Surveillance System (BRFSS) and the National 2009 H1N1 Flu Survey (NHFS). This report describes national findings from these surveys and updates previously published interim 2009–10 seasonal [3] and 2009 H1N1 [4] influenza vaccination coverage estimates. The interim estimates were based on vaccinations reported through the end of January 2010 using interviews conducted through February 2010. The final estimates in this report include vaccinations reported through May 2010 based on interviews through June 2010.

Key Findings
Seasonal Influenza Vaccination Coverage•National 2009–10 seasonal influenza vaccination coverage among all persons aged ≥6 months in the United States was 41.2% (95% confidence interval [CI] 40.8–41.6%).(Table 1)
•Among children aged 6 months –17 years, national seasonal influenza vaccination coverage [43.7% (95% CI 42.8–44.6)] was higher than coverage for adults ≥18 years [40.4% (95% CI 40.0–40.8%)].
•For adults aged 18–49 years, national seasonal influenza vaccination coverage was higher for persons with high–risk conditions [38.2% (95% CI 36.9–39.5%)] compared to those without high–risk conditions [28.4% (95% CI 27.8–29.0%)].
•Nationally, seasonal influenza vaccination coverage was highest among adults aged ≥65 years [69.6% (95% CI 69.0–70.2%)]. Among adults aged 50–64 years, national seasonal influenza vaccination coverage was 45.0% (95% CI 44.4–45.6%).
•For children aged 6 months –17 years, healthy adults aged 18–49 years, adults aged 18–49 years with high–risk conditions and adults aged ≥65 years, 2009–10 final estimates were higher than estimates for the same groups in the 2008–09 season [2008–09 estimates: 30.2% (95% CI 28.4–32.0%), 19.5% (95% CI 18.2–20.8%), 33.0% (95% CI 29.8–36.5%) and 65.6% (95% CI 63.3–67.8%) respectively; CDC, unpublished data, 2009 National Health Interview Survey (NHIS)].
•One or more seasonal influenza vaccine doses were administered to 31.6 million (95% CI 30.9–32.3 million) children and 91.6 million (95% CI 90.7–92.5 million) adults, for an estimated 123.3 million (95% CI 122.1–124.5 million) seasonal influenza vaccinees during August 2009 through May 2010.

full-text:
CDC - Seasonal Influenza (Flu) - Final Season Vaccination Estimates: United States, 2009-10 Influenza Season