TABLE 2.
Sample titers over all replicates and assaysa
| Virus | Sample no. | Geometric mean titer (median titer) |
GCV between laboratories (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Consensus | Reference laboratory E | All nonreference laboratories | Laboratory B | Laboratory C | Laboratory D | Laboratory A | |||
| H1N1 | H1-1 | 5 | 5 (5) | 5 (5) | 6 | 5 | 5 | 5 | 10.9 |
| H1-7 | 5 | 5 (5) | 5 (5) | 5 | 5 | 5 | 5 | 0.0 | |
| H1-4 | 6 | 6 (5) | 6 (5) | 6 | 6 | 5 | 5 | 10.9 | |
| H1-5 | 22 | 40 (40) | 19 (20) | 18 | 22 | 13 | 28 | 58.3 | |
| H1-10 | 24 | 36 (40) | 21 (20) | 5 | 38 | 20 | 57 | 156.4 | |
| H1-8 | 43 | 40 (40) | 44 (40) | 24 | 57 | 40 | 67 | 49.5 | |
| H1-2 | 64 | 80 (80) | 61 (40) | 40 | 80 | 45 | 95 | 49.5 | |
| H1-6 | 237 | 285 (320) | 226 (160) | 170 | 254 | 226 | 269 | 25.7 | |
| H1-9 | 234 | 254 (320) | 230 (160) | 160 | 240 | 160 | 453 | 53.1 | |
| H1-3 | 1,325 | 2,032 (2,560) | 1,191 (1,280) | 959 | 1,280 | 1,280 | 1,280 | 28.0 | |
| H3N2 | H3-3 | 5 | 5 (5) | 5 (5) | 6 | ND | 5 | 5 | 5.9 |
| H3-8 | 11 | 10 (10) | 11 (14) | 17 | ND | 12 | 7 | 43.4 | |
| H3-6 | 12 | 10 (10) | 13 (20) | 27 | ND | 13 | 7 | 75.5 | |
| H3-9 | 50 | 40 (40) | 54 (80) | 101 | ND | 48 | 34 | 62.1 | |
| H3-1 | 92 | 57 (57) | 109 (113) | 135 | ND | 101 | 95 | 43.4 | |
| H3-5 | 123 | 113 (113) | 127 (160) | 160 | ND | 113 | 113 | 18.9 | |
| H3-10 | 174 | 160 (160) | 180 (160) | 151 | ND | 202 | 190 | 14.7 | |
| H3-4 | 293 | 285 (320) | 296 (320) | 302 | ND | 320 | 269 | 11.1 | |
| H3-2 | 772 | 640 (640) | 822 (640) | 761 | ND | 806 | 905 | 15.5 | |
| H3-7 | 1,280 | 1,280 (1,280) | 1,280 (1,280) | 1,280 | ND | 1,280 | 1,280 | 0.0 | |
a
Laboratories E, B, and D, n = 12 per sample; laboratory C, n = 12 per H1N1 sample; laboratory A, n = 4 per sample; nonreference laboratories together, n = 40 per H1N1 sample and n = 28 per H3N2 sample; consensus titer, n = 52 per H1N1 sample and n = 40 per H3N2 sample; ND, no data.