TABLE 3.
Results of the parallel testing algorithm OraQuick-Determine-Instant-Screena
| Rapid-test algorithm results | Double EIA-Western blot algorithm results
|
||
|---|---|---|---|
| No. of samples positive | No. of samples negative | Total no. | |
| Positive | 474 | 33 | 507 |
| Negative | 0 | 2,993 | 2,993 |
| Total | 474 | 3,026 | 3,500 |
a
Test order is given left to right. A total of 3,500 serum samples were randomly selected from the remaining panel of 14,500 samples (1,000 had been selected for the first phase of the study), with a resultant HIV-1 seroprevalence of 13.5%. Results of the parallel rapid-test algorithm are compared with those of serial EIA and confirmatory Western blotting with the resulting performance characteristics: sensitivity, 100% (95% CI, 100%); specificity, 98.9% (95% CI, 98.6 to 99.3); PPV, 93.5% (95% CI, 92.7 to 94.3); NPV, 100% (95% CI, 100%).