Table 2.
Geometric Mean Titers by Strain* and Year: Prevaccination and Postvaccination
| T1† Geometric Mean Titer | T2† Geometric Mean Titer | T3.1† Geometric Mean Titer | T3.2† Geometric Mean Titer | T4† Geometric Mean Titer | T5† Geometric Mean Titer | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Strain | Year | n | Pre | Post | n | Pre | Post | n | Pre | Post | n | Pre | Post | n | Pre | Post | n | Pre | Post |
| A/Wisconsin/67//2005 | 2006/2007 H3N2 | 2 | 14.1 | 80.0 | 16 | 27.1 | 70.3 | 11 | 22.7 | 58.4 | 5 | 20.0 | 121.3 | 1 | 80.0 | 160.0 | |||
| A/New Caledonia/20/99 | 2006/2007 H1N1 | 2 | 10.0 | 56.6 | 16 | 18.3 | 140.5 | 11 | 15.5 | 132.4 | 5 | 20.0 | 139.3 | 1 | 80.0 | 160.0 | |||
| A/Wisconsin/67/2005 | 2007/2008 H3N2 | 11 | 40.0 | 109.6 | 16 | 36.7 | 160.0 | 4 | 33.6 | 134.5 | 7 | 48.8 | 195.0 | 11 | 27.4 | 160.0 | 1 | 20.0 | 160.0 |
| A/Solomon Islands/3/2006 | 2007/2008 H1N1 | 11 | 20.0 | 141.1 | 16 | 16.1 | 207.5 | 4 | 16.8 | 134.5 | 7 | 48.8 | 262.5 | 11 | 15.5 | 233.5 | 1 | 40.0 | 160.0 |
| A/Brisbane/10/2007 | 2008/2009 H3N2 | 9 | 18.5 | 80.0 | 19 | 14.9 | 103.3 | 9 | 10.0 | 80.0 | 4 | 20.0 | 113.1 | 18 | 10.0 | 37.0 | 9 | 13.6 | 50.4 |
| A/Brisbane/59/2007 | 2008/2009 H1N1 | 9 | 6.8 | 58.8 | 18 | 11.7 | 50.4 | 9 | 9.3 | 46.7 | 4 | 5.0 | 226.3 | 18 | 5.4 | 25.2 | 9 | 9.3 | 63.5 |
| A/Brisbane/10/2007 | 2009/2010 H3N2 | 11 | 16.6 | 37.6 | 33 | 17.3 | 89.2 | 13 | 34.1 | 122.6 | 8 | 25.9 | 73.4 | 6 | 22.5 | 48.0 | 4 | 10.0 | 190.3 |
| A/Brisbane/59/2007 | 2009/2010 H1N1 | 11 | 12.1 | 58.4 | 33 | 12.3 | 80.0 | 15 | 21.0 | 76.4 | 8 | 25.9 | 95.1 | 4 | 20.0 | 95.1 | 5 | 15.2 | 242.5 |
| A/California/7/09 | 2009 Pandemic H1N1 | 7 | 5.0 | 13.5 | 16 | 8.8 | 40.0 | 10 | 7.1 | 40.0 | 8 | 5.0 | 56.6 | 3 | 5.0 | 72.7 | 7 | 8.2 | 59.4 |
| Total All Strains and Years | 73 | 14.76 | 62.5 | 183 | 16.12 | 90.37 | 86 | 16.62 | 79.36 | 56 | 20 | 120.36 | 73 | 12.21 | 63.8 | 36 | 11.44 | 84.76 | |
*
The trivalent inactivated vaccine (TIV) has two influenza A antigens and 1 influenza B antigen. These data are presented by number of influenza A strains, not number of individual participants. For most participants, specimens were available to test both influenza A vaccine strains each year.
†
T1, Less than 13 weeks of gestation (first trimester); T2, 13–less than 28 weeks of gestation (second trimester); T3.1, 28–less than 34 weeks of gestation (early third trimester); T3.2, 34 weeks of gestation or more (late third trimester); T4, immediate postpartum (within 72 hours); and T5, approximately 6 weeks postpartum.