Level (U/ml)a | Specificity external controls | Sensitivity (%) in time intervals with reference to the onset of cough | ||||
---|---|---|---|---|---|---|
 |  | -21 to 0 days | 1 to 14 days | 15 to 21 days | 22 to 87 days | 1 to 87 days |
IgA | Â | Â | Â | Â | Â | Â |
24 | 90.0% | 33 | 100 | 100 | 97 | 98 |
40 | 95.0% | 33 | 63 | 82 | 95 | 90 |
52 | 97.5% | 17 | 63 | 82 | 92 | 88 |
74 | 99.0% | 17 | 63 | 64 | 78 | 75 |
GMC (U/ml) | Â | 11 | 60 | 136 | 212 | 177 |
IgG | Â | Â | Â | Â | Â | Â |
27 | 90.0% | 33 | 75 | 100 | 97 | 95 |
41 | 95.0% | 33 | 75 | 91 | 95 | 93 |
65 | 97.5% | 33 | 50 | 82 | 94 | 87 |
90 | 99.0% | 33 | 38 | 82 | 86 | 81 |
100b | 99–100% | 33 | 38 | 82 | 84 | 80 |
GMC (U/ml) | Â | 8 | 48 | 390 | 506 | 391 |
No. samples | Â | 6 | 8 | 11 | 64 | 83 |