TABLE 2.
Sensitivity of dipstick assay and other serological tests in relation to duration of the disease
| Testa | Sensitivity (%) at mo after onset of disease:
|
|||
|---|---|---|---|---|
| 0–2 | 2–4 | 4–6 | >6 | |
| Dipstick assay | 89.0 | 83.1 | 32.6 | 29.8 |
| SAT | 79.5 | 64.4 | 76.9 | 50.6 |
| SAT-DTT and 2-MEb | 67.1 | 19.1 | 13.5 | 6.0 |
| Coombs test | 39.7 | 88.1 | 92.3 | 81.8 |
a
The dipstick assay was considered positive when a staining intensity of >1+ was observed. The SAT was considered positive when a titer of ≥1:160 was obtained. The 2-ME test and the SAT-DTT were considered positive when a ≥4-fold reduction in titer compared with that of the SAT was observed. The Coombs test was considered positive when a ≥4-fold increase in titer was measured.
b
The SAT-DTT was performed on the samples from Spain. The 2-ME test was performed on the samples from Portugal. The SAT-DTT or the 2-ME test was not done for the samples from Russia and The Netherlands.