The prevalence of HIV/AIDS in Botswana was estimated at 25.4% for adults aged 15–49 in 2009 and 21.9% in 2013, exceeded by Lesotho and Swaziland in sub-Saharan African nations. This places Botswana at the third highest prevalence in the world, in 2013, while "leading the way in prevention and treatment programmes". In 2003, the government began a comprehensive program involving free or cheap generic antiretroviral drugs as well as an information campaign designed to stop the spread of the virus; in 2013, over 40% of adults in Botswana had access to antiretroviral therapy. In the age group of 15–19 years old, prevalence was estimated at about 6% for females and 3.5% for males in 2013, and for the 20–24 age group, 15% for females and 5% for males. Botswana is one of 21 priority countries identified by the UN AIDS group in 2011 in the Global Plan to eliminate new HIV infections among children and to keep their mothers alive. From 2009 to 2013, the country saw a decrease over 50% in new HIV infections in children. A further measure of the success, or reason for hope, in dealing with HIV in Botswana, is that less than 10% of pregnant HIV-infected women were not receiving antiretroviral medications in 2013, with a corresponding large decrease (over 50%) in the number of new HIV infections in children under 5. Among the UN Global Plan countries, people living with HIV in Botswana have the highest percentage receiving antiretroviral treatment: about 75% for adults (age 15+) and about 98% for children.