Epidemiology
UNAIDS and WHO modify their estimates as new data, research and analyses emerge. As advances are made to the methodology of data collection and surveillance, the estimates of numbers of people living with HIV are revised to reflect these improvements. Revisions are also made retrospectively for each year to allow for a more accurate assessment of the epidemic's evolution over time. For this reason, it is inaccurate to draw conclusions by comparing the estimates from one report to another.
Epidemiological data
Latest data:
- HIV estimates with uncertainty bounds 2009 (2010, 78Kb, xls)
- HIV estimates with uncertainty bounds 2001, 2009 (2010, 163Kb, xls)
- HIV estimates with uncertainty bounds 1990-2009 (2010, 1.3Mb, xls)
- Country fact sheets
Epidemiology publications
UNAIDS/WHO Working Group on Global HIV/AIDS and STI Surveillance
Global surveillance of HIV/AIDS and STI is a joint effort of UNAIDS and WHO. The UNAIDS/WHO Working Group on Global HIV/AIDS and STI Surveillance is the main coordination and implementation mechanism to compile the best information available and to improve the quality of data needed for informed decision-making and planning at national, regional and global levels.
The Working Group gathers examples of best practices and experiences from all regions on the collection of HIV, AIDS, STI and behavioral data at country level and uses them to develop global guidelines and training materials to be used in designing, monitoring and evaluating national surveillance systems.
Epi Alert
UNAIDS quarterly update on HIV epidemiology:
- 2010 Q2: Network scale-up: A promising method for national estimates of the sizes of populations at higher risk
- 2010 Q1: Methods for estimating HIV incidence
- Guidance for inclusion of HIV prevalence measurement in national surveys (UNAIDS/WHO Working Group On Global HIV/AIDS and STI Surveillance, 2010)
