Prevalence of HIV, total (% of population ages 15-49)
The limited availability of data on health status is a major constraint in assessing the health situation in developing countries. Surveillance data are lacking for many major public health concerns. Estimates of prevalence and incidence are available for some diseases but are often unreliable and incomplete. National health authorities differ widely in capacity and willingness to collect or report information.
Prevalence of HIV refers to the percentage of people ages 15-49 who are infected with HIV.