Volume 17, Number 9—September 2011
Research
Estimating Effect of Antiviral Drug Use during Pandemic (H1N1) 2009 Outbreak, United States
Table 1
Number of pandemic (H1N1) 2009 cases versus number of influenza antiviral prescriptions filled during pandemic (H1N1) 2009 outbreak, United States, April 24, 2009–March 26, 2010*
| Week† | Mid-level estimate of cases‡ | Filled influenza antiviral prescriptions |
||
|---|---|---|---|---|
| Oseltamivir | Zanamivir | Total | ||
| 2009 Apr–Jul | 3,052,768 | 1,243,827 | 69,513 | 1,313,340 |
| 2009 Aug |
1,605,760 |
342,386 |
11,645 |
354,031 |
| 35 | 626,256 | 146,282 | 5,097 | 151,379 |
| 36 | 1,675,630 | 234,211 | 7,171 | 241,382 |
| 37 | 1,302,846 | 265,626 | 7,892 | 273,518 |
| 38 | 1,508,514 | 331,060 | 8,735 | 339,795 |
| 39 | 2,319,691 | 383,759 | 9,981 | 393,740 |
| 40 | 4,461,542 | 435,546 | 11,625 | 447,171 |
| 41 | 6,549,205 | 471,323 | 11,226 | 482,549 |
| 42 | 7,120,298 | 527,362 | 11,218 | 538,580 |
| 43 | 6,297,210 | 671,741 | 12,046 | 683,787 |
| 44 | 5,899,647 | 640,887 | 9,306 | 650,193 |
| 45 | 5,013,181 | 537,781 | 6,338 | 544,119 |
| 46 | 3,350,286 | 386,569 | 4,863 | 391,432 |
| 47 | 1,767,166 | 273,092 | 3,039 | 276,131 |
| 48 | 1,020,606 | 152,482 | 1,857 | 154,339 |
| 49 | 804,901 | 133,998 | 1,782 | 135,780 |
| 50 | 646,358 | 99,565 | 1,348 | 100,913 |
| 51 | 612,204 | 88,718 | 1,338 | 90,056 |
| 52 | 619,080 | 64,807 | 1,010 | 65,817 |
| 1 | 418,803 | 56,569 | 1,009 | 57,578 |
| 2 | 520,390 | 50,642 | 981 | 51,651 |
| 3 | 516,958 | 50,326 | 1,057 | 51,307 |
| 4 | 356,400 | 44,770 | 1,048 | 45,827 |
| 5 | 493,448 | 43,757 | 1,211 | 44,805 |
| 6 | 322,623 | 42,474 | 1,251 | 43,685 |
| 7 | 312,327 | 43,809 | 1,228 | 45,060 |
| 8 | 281,986 | 47,146 | 1,487 | 48,374 |
| 9 | 245,707 | 48,671 | 1,494 | 50,158 |
| 10 | 288,215 | 47,261 | 1,587 | 48,755 |
| 11 | 225,448 | 33,867 | 1,043 | 34,910 |
| 12 |
312,575 |
26,072 |
730 |
26,802 |
| Total | 60,548,030 | 7,966,386 | 211,156 | 8,177,542 |
*IMS Health Xponent database (3) includes 57,544 oseltamivir prescriptions and 877 zanamivir prescriptions for week 53. Because the Centers for Disease Control and Prevention only reports 52 weeks for 2009, we removed week 53 from the IMS data set (IMS, Norwalk, CT, USA).
†Estimates of cases for April–August 2009 are not available on a weekly basis.
‡Mid-level weekly cases estimated from (1) and www.cdc.gov/h1n1flu/estimates_2009_h1n1.htm.
