Table 4.
Number of Sequences Added to Clusters Between 2007 and 2009, According to Risk Group and to Cluster Size in 2007
| HIV Subtype, Initial Cluster Size | Crossover | HET | PWID | MSM | NA | Total |
|---|---|---|---|---|---|---|
| A1 | ||||||
| Overall | 7/630 (1.11) | 76/630 (12.1) | 7/630 (1.11) | 14/630 (2.22) | 51/630 (8.1) | 155/630 (24.6) |
| 1 sequence | 2 | 41 | 2 | 2 | 44 | 91 |
| ≥2 sequences | 5 | 35 | 5 | 12 | 7 | 64 |
| C | ||||||
| Overall | 81/4852 (1.67) | 620/4852 (12.78) | 38/4852 (0.78) | 40/4852 (0.82) | 432/4852 (8.9) | 1211/4852 (24.96) |
| 1 sequence | 15 | 362 | 5 | 7 | 320 | 709 |
| ≥2 sequences | 66 | 258 | 33 | 33 | 112 | 502 |
| D | ||||||
| Overall | 2/279 (0.72) | 14/279 (5.02) | 1/279 (0.36) | 1/279 (0.36) | 13/279 (4.66) | 31/279 (11.11) |
| 1 sequence | 0 | 8 | 1 | 1 | 7 | 17 |
| ≥2 sequences | 2 | 6 | 0 | 0 | 6 | 14 |
| G | ||||||
| Overall | 9/472 (1.91) | 30/472 (6.36) | 3/472 (0.64) | 0/472 (0) | 18/472 (3.81) | 60/472 (12.71) |
| 1 sequence | 9 | 14 | 2 | 0 | 15 | 40 |
| ≥2 sequences | 0 | 16 | 1 | 0 | 3 | 20 |
| All subtypes | ||||||
| Overall | 99/6233 (1.59) | 740/6233 (11.87) | 49/6233 (0.79) | 55/6233 (0.88) | 514/6233 (8.25) | 1457/6233 (23.38) |
| 1 sequence | 26 | 425 | 10 | 10 | 386 | 857 |
| ≥2 sequences | 73 | 315 | 39 | 45 | 128 | 600 |
Data are no. of sequences added to all clusters of the risk group per cluster size of interest or no. of sequences added to all clusters of the risk group per cluster size of interest/total no. of new sequences for each subtype (%).
Abbreviations: HET, heterosexual; HIV, human immunodeficiency virus; MSM, men who have sex with men; NA, not available; PWID, people who inject drugs.