Table 4. Proportion of transmissions by stage in the HIV infection and care continuum.
Infection/care stage of transmitter% of transmissions by time of diagnosis of recipient MSM (95% confidence interval)
Overall
(n = 617)
Jul. 1996 to
Apr. 2006
(n = 165)
May 2006 to
Dec. 2007
(n = 145)
Jan. 2008 to
Jun. 2009
(n = 151)
Jul. 2009 to
Dec. 2010
(n = 156)
Undiagnosed (total)70.9 (65.8–72.5)67.6 (59.3–72.7)72.3 (64.2–76.9)71.8 (63.4–76.3)72.2 (63.3–76.3)
  Confirmed recent infection at diagnosis15.5 (11.9–17.4)15 (7.6–19.4)21.7 (15–26.5)16.4 (11–20.8)9.4 (5.6–14.1)
  Estimated to have recent infection25.1 (19.4–28.1)17.3 (11.7–22.7)23 (15.1–30.1)25.9 (15.4–33.6)34.6 (19.4–43.4)
  Estimated to have chronic infection30.3 (28–34)35.2 (30.2–42)27.6 (22.4–34)29.5 (24.2–36.1)28.2 (23–35.7)
Diagnosed (total)22.4 (20.7–26.2)23.6 (18.5–29.7)22.9 (18.6–29.1)22.8 (18.3–29.4)20.7 (17.4–27.3)
  Diagnosed <3 months, recent infection at diagnosis2.9 (2.2–4.1)2.5 (1–4.9)3.2 (1.7–5.5)3 (1.9–5.4)2.8 (1.8–4.4)
  No CD4 measured1.6 (1.2–2.4)2.9 (1.6–4.8)0.8 (0.4–1.8)1.5 (0.6–3)1 (0.6–2.1)
  CD4 >5008.3 (7–10.3)10.2 (6.7–14.2)7 (4.5–10.8)8.7 (5.9–12.5)7.1 (5.4–10.1)
  CD4 in 350–5006.4 (5.4–7.9)4.8 (2.6–7.8)7.3 (5.1–10.5)5.9 (4.2–8.3)7.7 (5.7–11)
  CD4 <3503.4 (2.5–4.3)3.2 (1.2–5.5)4.6 (2.6–6.6)3.7 (2.2–5.6)2.1 (1.3–3.3)
ART initiated (total)5.7 (5.2–7.8)7 (4.8–11.7)3.7 (2.2–6.5)4.9 (3.7–8.1)6.7 (5.4–10.2)
  Before first viral suppression1.8 (1.6–2.7)2.2 (1.2–4.4)0.7 (0.4–1.5)1.3 (0.9–2.6)2.8 (2.1–4.6)
  After first viral suppression
    No viral load measured0.5 (0.3–1)0.9 (0.1–2.4)0.1 (0–0.3)0.3 (0.1–0.9)0.8 (0.4–1.8)
    No viral suppression1.4 (0.9–2.1)2.8 (1.2–5.2)1.2 (0.4–2.6)0.9 (0.4–1.9)0.5 (0.1–1)
    Viral suppression, one observation0.4 (0.3–0.8)0.1 (0–0.5)0.2 (0–0.8)0.5 (0.2–1.7)0.6 (0.3–1.5)
Viral suppression, ≥2 observations1.6 (1.1–2.5)1 (0.1–2.6)1.5 (0.6–3.1)1.9 (0.9–3.6)2 (1.1–3.6)
Not in contact1 (0.7–1.6)1.8 (0.8–3.4)1.1 (0.4–2.3)0.5 (0.2–1.4)0.4 (0.2–0.8)
Recent infection (total)43.5 (36.6–46)34.9 (25.4–40.6)47.9 (36.9–54.8)45.3 (33.3–54.1)47.7 (32.8–53.8)