Table 3.
Geometric mean titers (GMT) a against study influenza A viruses by age group b and overall.
| GMT [Mean (95% CI)] | |||||
|---|---|---|---|---|---|
| Virus | Subclade | Juvenile c | Adult d | Senior e | Overall |
| A/Swine/OH/2011 (H1N2) | delta1 | 13 (9, 18) | 17 (11, 27) | 24 (17, 34) | 18 (14, 22) |
| A/Swine/OH/2013 (H1N2) | delta2 | 8 (6, 10) | 31 (20, 48) | 14 (10, 21) | 17 (13, 21) |
| A/Swine/IN/2013 (H1N1) | gamma | 35 (20, 61) | 39 (25, 60) | 30 (20, 44) | 35 (27, 46) |
| A/Swine/SD/2013 (H1N1) | gamma2 | 49 (29, 85) | 91 (62, 134) | 34 (23, 51) | 58 (44, 75) |
| A/CA/2009 (H1N1) | pdmH1 | 47 (30, 74) | 78 (45, 137) | 36 (24, 54) | 49 (38, 65) |
| A/Swine/MN/2010 (H3N2) | C_IV-A | 19 (13, 29) | 136 (95, 197) | 29 (20, 41) | 50 (38, 64) |
| A/Swine/OH/2011 (H3N2) | C_IV-A | 11 (8, 15) | 110 (64, 187) | 39 (27, 56) | 33 (25, 44) |
| A/Swine/NC/2013 (H3N2) | C_IV-A | 46 (29, 72) | 267 (200, 357) | 94 (63, 139) | 120 (94, 152) |
| A/Swine/MI/2016 (H3N2) | C_IV-A | 9 (7, 12) | 48 (31, 73) | 25 (16, 37) | 24 (19, 31) |
| A/Swine/MN/2012 (H3N2) | C_IV-B | 10 (8, 14) | 30 (22, 42) | 18 (13, 24) | 19 (16, 23) |
| A/Swine/NE/2012 (H3N2) | C_IV-F | 19 (12, 31) | 163 (109, 244) | 42 (27, 66) | 60 (45, 80) |
| A/Swine/OH/2016 (H3N2) | human-like | 95 (62, 146) | 77 (48, 121) | 64 (43, 95) | 78 (60, 100) |
| A/TX/2012 (H3N2) | human | 179 (119, 269) | 71 (40, 127) | 83 (57, 120) | 104 (80, 136) |
a GMTs are reported as the inverse ratio of the titer; individual titers below 10 (HAI < 1:10) were transformed to a nominal titer of 5 for mean titer calculations; b Age groups constructed based on those utilized in the Tool for Influenza Pandemic Risk Assessment (TIPRA) [24]; c Individuals < 18 years old; d Individuals 18–49 years old; e Individuals ≥ 50 years old.