Volume 19, Number 3—March 2013
Research
Effects of Vaccine Program against Pandemic Influenza A(H1N1) Virus, United States, 2009–2010
Rebekah H. Borse1, Sundar S. Shrestha, Anthony E. Fiore, Charisma Y. Atkins, James A. Singleton, Carolyn Furlow, and Martin I. Meltzer
Table 3
Estimated number of cases of influenza prevented by vaccination against influenza A(H1N1)pdm09 virus*
| Subgroup |
No. clinical cases in absence of vaccination program (range) |
No. clinical cases prevented by a vaccination program (range) |
No. doses administered to avoid 1 clinical case (range) |
| 6 mo–9 y | 12,333,906 (8,766,004–18,088,655) | 81,518 (52,081–100,349) | 326 (265–511) |
| 10–24 y (10–17 all, 18–24 NP) | 13,891,877 (9,879,008–20,374,801) | 300,724 (212,953–420,991) | 53 (38–75) |
| Pregnant 18–64 y | 1,410,032 (1,004,978–2,062,896) | 71,601 (53,084–97,884) | 34 (25–45) |
| 25–64 y, HR, NP | 8,378,054 (5,957,746–12,286,626) | 164,958 (116,575–228,593) | 56 (40–79) |
| 25–64 y, HCW, non-HR, NP | 3,530,341 (2,510,291–5,178,995) | 123,427 (87,287–177,144) | 51 (35–72) |
| 25–64, contact with <6 mo, non-HCW, non-HR, NP | 1,550,007 (1,101,603–2,276,098) | 29,063 (19,904–43,129) | 70 (47–102) |
| 25–64 y, noncontact with <6 mo, non-HCW, non-HR, NP | 14,734,336 (10,470,235–21,640,930) | 163,327 (107,305–248,548) | 94 (62–143) |
| >65 y |
6,038,353 (4,290,972–8,868,687) |
94,538 (63,719–142,293) |
114 (76–169) |
| Total |
61,866,905 (43,980,837–90,777,687) |
1,029,157 (712,908–1,458,930) |
86 (61–124) |
| *All values are estimates. NP, not pregnant; HR, high risk; HCW, health care worker; contact, household contacts and caregivers of children <6 mo of age. | |||
1Current affiliation: Merck & Co., Inc., Lansdale, Pennsylvania, USA.
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