Table 2. Estimates of cumulative weekly number of influenza A(H1N1)pdm09 virus vaccine doses administered (rounded to the nearest 1,000), by population subgroup*.

Week‡	Week ending	No. persons vaccinated	No. doses	Estimated doses by population subgroup†
				Age 6 mo–9 y		Age 10–24 y	Pregnant, Age 18–64 y§	Age 25–64 y				Age >65 y
				1st dose	2nd dose			HR, NP	HCW, non-HR, NP	Contact with children <6 mo, non-HCW, non-HR, NP	No contact with children <6 mo, non-HCW, non-HR, NP
40	2009 Oct 10	2,971,000	2,971,000	836,000	0	578,000	171,000	314,000	283,000	69,000	363,000	358,000
41	2009 Oct 17	6,536,000	6,536,000	1,838,000	0	1,272,000	376,000	690,000	622,000	151,000	799,000	788,000
42	2009 Oct 24	10,993,000	10,993,000	3,091,000	0	2,139,000	633,000	1,161,000	1,046K	254K	1,343K	1,325K
43	2009 Oct 31	17,826,000	17,944,000	5,013,000	119,000	3,469,000	1,026,000	1,882,000	1,696,000	412,000	2,178,000	2,148,000
44	2009 Nov 7	23,755,000	24,239,000	6,526,000	483,000	4,776,000	1,230,000	2,467,000	2,275,000	573,000	3,116,000	2,790,000
45	2009 Nov 14	29,684,000	30,533,000	8,040,000	848,000	6,084,000	1,435,000	3,053,000	2,853,000	734,000	4,054,000	3,433,000
46	2009 Nov 21	35,613,000	36,827,000	9,553,000	1,213,000	7,391,000	1,639,000	3,638,000	3,431,000	895,000	4,991,000	4,075,000
47	2009 Nov 28	41,543,000	43,121,000	11,067,000	1,578,000	8,698,000	1,843,000	4,223,000	4,009,000	1,056,000	5,929,000	4,717,000
48	2009 Dec 5	45,427,000	47,709,000	11,837,000	2,282,000	9,511,000	1,911,000	4,717,000	4,275,000	1,146,000	6,799,000	5,231,000
49	2009 Dec 12	49,311,000	52,297,000	12,608,000	2,985,000	10,325,000	1,978,000	5,211,000	4,540,000	1,235,000	7,669,000	5,745,000
50	2009 Dec 19	53,196,000	56,885,000	13,379,000	3,689,000	11,138,000	2,045,000	5,705,000	4,805,000	1,325,000	8,539,000	6,259,000
51	2009 Dec 26	57,080,000	61,473,000	14,150,000	4,393,000	11,952,000	2,112,000	6,199,000	5,071,000	1,414,000	9,409,000	6,773,000
52	2010 Jan 3	59,526,000	64,388,000	14,541,000	4,862,000	12,406,000	2,171,000	6,480,000	5,217,000	1,463,000	10,031,000	7,217,000
1	2010 Jan 10	61,972,000	67,304,000	14,931,000	5,332,000	12,860,000	2,230,000	6,760,000	5,364,000	1,513,000	10,653,000	7,661,000
2	2010 Jan 17	64,417,000	70,219,000	15,322,000	5,802,000	13,313,000	2,289,000	7,040,000	5,510,000	1,562,000	11,275,000	8,105,000
3	2010 Jan 24	66,863,000	73,134,000	15,713,000	6,271,000	13,767,000	2,349,000	7,320,000	5,657,000	1,611,000	11,897,000	8,550,000
4	2010 Jan 31	69,309,000	76,050,000	16,103,000	6,741,000	14,221,000	2,408,000	7,601,000	5,803,000	1,660,000	12,519,000	8,994,000
5	2010 Feb 7	70,924,000	77,979,000	16,353,000	7,055,000	14,489,000	2,408,000	7,846,000	5,863,000	1,702,000	12,999,000	9,263,000
6	2010 Feb 14	72,539,000	79,907,000	16,603,000	7,369,000	14,757,000	2,408,000	8,092,000	5,924,000	1,745,000	13,479,000	9,532,000
7	2010 Feb 21	74,154,000	81,836,000	16,852,000	7,683,000	15,025,000	2,408,000	8,338,000	5,984,000	1,787,000	13,959,000	9,802,000
8	2010 Feb 28	75,769,000	83,765,000	17,102,000	7,997,000	15,293,000	2,408,000	8,583,000	6,044,000	1,829,000	14,438,000	10,071,000
9	2010 Mar 7	76,480,000	84,633,000	17,196,000	8,153,000	15,386,000	2,408,000	8,713,000	6,090,000	1,874,000	14,613,000	10,200,000
10	2010 Mar 14	77,192,000	85,501,000	17,291,000	8,309,000	15,478,000	2,408,000	8,842,000	6,137,000	1,920,000	14,788,000	10,328,000
11	2010 Mar 21	77,903,000	86,369,000	17,386,000	8,465,000	15,570,000	2,408,000	8,971,000	6,184,000	1,965,000	14,963,000	10,456,000
12	2010 Mar 28	78,615,000	87,236,000	17,481,000	8,622,000	15,662,000	2,408,000	9,101,000	6,230,000	2,010,000	15,138,000	10,585,000
13	2010 Apr 4	78,943,000	87,680,000	17,536,000	8,737,000	15,743,000	2,408,000	9,144,000	6,239,000	2,017,000	15,207,000	10,649,000
14	2010 Apr 11	79,272,000	88,124,000	17,592,000	8,852,000	15,824,000	2,408,000	9,188,000	6,247,000	2,024,000	15,276,000	10,713,000
15	2010 Apr 18	79,600,000	88,568,000	17,648,000	8,968,000	15,905,000	2,408,000	9,232,000	6,255,000	2,030,000	15,345,000	10,778,000

*Monthly estimates, by population subgroups, are from the National 2009 H1N1 Flu Survey (NHFS) and the Behavioral Risk Factor Surveillance System survey (4,9,10,14,16,28). Estimates were benchmarked to final season monthly estimates for available age and target groups (9). Adjustments were made to overall population counts and the number of persons vaccinated to account for limitations in either dataset. The distribution of weekly and monthly numbers of persons vaccinated were obtained from the survey data. HR, high risk; NP, not pregnant; HCW, health care worker; Contact, household contacts and caregivers of children <6 mo of age.
†Weekly estimates were made by examining overall National 2009 H1N1 Flu Survey weekly vaccination numbers and by using the same distribution to estimate the first 3 weeks of data. For all other weeks, data were estimated by using linear interpolation between point estimates at the start and end of each month.
‡Weeks during which influenza activity was reported during 2009–10 influenza reporting period; 40 –52 indicates last 12 weeks of 2009, and 1–15 indicates first 15 weeks of 2010.
§Estimated number of pregnant women from survey data was considered an underestimation because of the definition of pregnant women and low sample size. Therefore, the total number of pregnant women vaccinated during the course of the pandemic was based on data from Moro et al (18). Because the cohort of pregnant women changed during the influenza season, analysis for this group was restricted to NHFS interviews conducted April 4, 2010–Jun 30, 2010. During this time, a new question, “Were you pregnant at any time October 2009 through January 2010?” was added to the NHFS for women 18–64 y to include those pregnant during the major vaccination period. Because no information was available on vaccinations among pregnant women after January, we assumed no further vaccinations were administered, an approach that could have underestimated the effects of A(H1N1)pdm09 virus vaccination on pregnant women.