Table 2.
Prevalence and Incidence of Laboratory-Diagnosed Sexually Transmitted Infections (STIs) and Clinical Symptoms
| Prevalence, % (Proportion) |
Incidence, Cases/100 py (95% CI) | |||
|---|---|---|---|---|
| Variable | Enrollment (n = 242) | 6 mo (n = 260) | 12 mo (n = 189) | |
| Laboratory diagnosis | ||||
| HSV-2 serology | 86.0 (208/242) | 90.1 (183/203) | 91.0 (171/188) | 26.0 (11.2–51.2) |
| HSV-2 PCR | 3.7 (9/241) | 1.5 (3/205) | 2.2 (4/185) | 4.1 (2.2–6.9) |
| T. pallidum | 2.9 (7/242) | 3.0 (6/202) | 1.6 (3/184) | 2.1 (.8–4.3) |
| BV | 52.7 (127/241) | 46.8 (96/205) | 42.9 (79/184) | 50.5 (40.9–61.6) |
| T. vaginalis | 20.3 (49/241) | 13.2 (27/205) | 17.3 (32/185) | 14.7 (10.7–19.7) |
| N. gonorrhoeae | 5.4 (13/240) | 2.0 (4/205) | 2.2 (4/184) | 3.3 (1.6–5.8) |
| C. trachomatis | 4.2 (10/240) | 4.4 (9/205) | 3.3 (6/184) | 4.8 (2.7–7.7) |
| M. genitalium | 1.2 (3/241) | 1.5 (3/205) | 3.8 (7/185) | 3.8 (2.0–6.5) |
| Any STI (excluding BV and HSV-2 serology) | 31.3 (75/240) | 21.7 (44/203) | 27.5 (50/182) | 26.7 (20.8–33.7) |
| 1 | 25.3 (61/241) | 17.6 (36/205) | 24.3 (45/185) | … |
| >1 | 5.8 (14/241) | 3.9 (8/205) | 2.7 (5/185) | … |
| Clinical diagnosis | ||||
| Vaginal discharge | 15.3 (37/242) | 1.5 (3/203) | 4.8 (9/189) | 14.2 (10.6–18.5) |
Abbreviations: BV, bacterial vaginosis; CI, confidence interval; C. trachomatis, Chlamydia trachomatis; HSV-2, herpes simplex virus 2; Mycoplasma genitalium, M. genitalium; N. gonorrhoeae, Neisseria gonorrhoeae; PCR, polymerase chain reaction; py, person-years; T. pallidum, Treponema pallidum; T. vaginalis, Trichomonas vaginalis.