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

Image via WikipediaBecause 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].

The final estimates in this report include vaccinations reported through May 2010 based on interviews through June 2010.

Key Finding:

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%).

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CI 28.4–32.0%), 19.5% (95% CI 18.2–20.8%), 33.0% (95% CI 29.8–36.5%) and 65.6% (95% CI 63.3–67.8%) respectively; CDC, unpublished data, 2009 National Health Interview Survey (NHIS)].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.

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