Table 3 Results of confirmatory strategies for positive PT and AC2 tests
Confirmatory strategyAssayPharyngeal GCRectal GCPharyngeal CTRectal CT
Initial test positivePT2627421
AC22029722
Repeat test positivePT23 (88.5%)27 (100%)4 (100%)20 (95.2%)
AC220 (100%)29 (100%)7 (100%)22 (100%)
ACT/AGC +ve (same specimen)PT
AC220 (100%)29 (100%)7 (100%)22 (100%)
2nd NAAT +ve (duplicate specimen)PT18 (69.2%)27 (100%)4 (100%)18 (85.7%)
AC218 (90.0%)27 (93.1%)4 (57.1%)18 (81.8%)
Positive at another sitePT12 (46.2%)17 (63.0%)1 (25.0%)6 (28.6%)
AC215 (75.0%)18 (62.1%)3 (42.9%)7 (31.8%)
Positive contactPT15 (57.7%)10 (37.0%)0 (0%)7 (33.3%)
AC29 (45.0%)11 (37.9%)0 (0%)5 (22.7%)
  • AC2, Aptima Combo 2; CT, Chlamydia trachomatis; GC, Neisseria gonorrhoeae; NAATs, nucleic acid amplification tests; PT, BD Probetec ET system.