TABLE 3.
Reproducibility of HAI titers is high between laboratories
| Laboratory | Interlaboratory reproducibility |
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|---|---|---|---|---|---|---|
| No. of samples with GMT differing >2-fold from reference (laboratory E) GMT/total no. of samples (%) |
No. of samples with GMT differing >2-fold from consensus GMT/total no. of samples (%) |
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| H1N1 | H3N2 | All viruses | H1N1 | H3N2 | All viruses | |
| A | 0/10 (0) | 0/10 (0) | 0/20 (0) | 0/10 (0) | 0/10(0) | 0/20 (0) |
| B | 1/10 (10) | 2/10 (20) | 3/20 (15) | 1/10 (10) | 0/10 (0) | 1/20 (5) |
| C | 0/10 (0) | NDb | 0/10 (0) | 0/10 (0) | ND | 0/10 (0) |
| D | 1/10 (10) | 0/10 (0) | 1/20 (5) | 0/10 (0) | 0/10 (0) | 0/20 (0) |
| E | NAa | NA | NA | 0/10 (0) | 0/10 (0) | 0/20 (0) |
| Overall | 2/40 (5) | 2/30 (6.7) | 4/70 (5.7) | 1/50 (2) | 0/40 (0) | 1/90 (1.1) |
a
NA, not applicable.
b
ND, no data.