Volume 19, Number 3—March 2013
Effects of Vaccine Program against Pandemic Influenza A(H1N1) Virus, United States, 2009–2010
|Subgroup||Population||% Vaccinated||No. doses recommended for full coverage||% Assumed outcomes
|Vaccine effectiveness†||Clinical cases and hospitalizations||Deaths|
|6 mo–9 y||39,429,115||1st dose/45, 2nd dose/23||2 doses, 4 wks apart||1st dose/0, 2nd dose/62||20.1||6.0|
|10–24 y (10–17 all, 18–24 NP)||59,684,833||27||1||62||22.3||8.0|
|Pregnant 18–64 y||5,578,782||43||1||62||2.2||4.0|
|25–64 y, HR, NP||33,949,395||27||1||62||13.5||24.0|
|25–64 y, HCW, non-HR, NP||17,451,921||36||1||62||5.6||9.0|
|25–64 y, contact <6 mo, non-HCW, non-HR, NP||8,933,718||23||1||62||2.5||6.0|
|25–64 y, non-contact <6 mo, non-HCW, non-HR, NP||96,235,755||16||1||62||24.0||30.0|
*NP, not pregnant; HR, high risk; HCW, health care worker; contact, household contacts and caregivers of children <6 months of age; NA, not applicable.
†Data are for effectiveness against clinical cases, hospitalizations, and deaths. For population subgroup 6 mo–9 y, we assumed the vaccine reached effectiveness levels 2 wk after full coverage (12).
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1Current affiliation: Merck & Co., Inc., Lansdale, Pennsylvania, USA.