Table 3 Chlamydia samples: results of initial and confirmatory testing

Site of infection	Positive (BD SDA)	Samples retested (STBRL)	Confirmatory testing at STBRL			LGV serovar identified
Site of infection	Positive (BD SDA)	Samples retested (STBRL)	Positive	Negative	Equivocal	LGV serovar identified
Urethral	165	86/165 (52.1%)	79/86 (91.8%)	3/86 (3.5%)	4/86 (4.7%)	1/86 (1.2%)
Rectal	247	242/247 (98.0%)	227/242 (94.2%)	9/242 (3.7%)	6/242 (2.5%)	35/242 (14.5%)

BD SDA, Beckton-Dickinson Probe-Tec Strand Displacement Assay; STBRL, Sexually Transmitted Bacteria Reference Laboratory (Colindale); Equivocal, an inconclusive result.