Epidemic Profiles| Extent of HIV infection | Highest prevalence in a key populationa (percent) | Prevalence in the general population (percent) | WHO region |
| Low level | < 5 | < 1 | Middle East and North Africa |
| Concentratedb | > 5 | < 1 | East Asia and the Pacific, Europe and Central Asia, Latin America and the Caribbean, South Asia |
| Generalized low level | ≥ 5 | 1-10 | Sub-Saharan Africa |
| Generalized high level | ≥ 5 | ≥ 10 | Sub-Saharan Africa |
Source: Adapted from UNAIDS 2004.
a. Key populations include sex workers, men who have sex with men, and drug injecting users.
b. We consider three types of concentrated epidemics depending on the key population most affected: sex workers, men who have sex with men, or drug injecting users.
