Table 1 Comparison of reference confirmation and initial results for detection of C trachomatis in rectal specimens.
| Results of C trachomatis confirmatory real time PCR tests | Category of test used at local laboratory to determine positive status of rectal specimen | ||||
|---|---|---|---|---|---|
| EIA | Culture | NAATS: breakdown | |||
| SDA | Cobas Amplicor | Aptima Combo Two | |||
| Positive | 17 | 21 | 1144 | 411 | 20 |
| Negative | 25 | 3 | 56 | 39 | 3 |
| Inhibitory | 4 | 0 | 15 | 6 | 1 |
| Equivocal | 2 | 0 | 10 | 5 | 0 |
| % Confirmed positive (positive specimens/total number examined) | 35.4 | 87.5 | 93.4 | 89.2 | 83.3 |
EIA, enzyme immunoassay; NAATs, nucleic acid amplification tests; PCR, polymerase chain reaction; SDA, strand displacement assay.