From the 2006 population-based survey, Botswana AIDS Impact Survey (BIAS II), the national average prevalence was estimated at 17.1 per cent, while for those aged 15-49 years, it was estimated that 24 per cent was HIV-positive (CSO/NACA, 2005). A third population-based survey was completed and preliminary results have just been released indicating some slight increase in prevalence to 17.6 per cent (CSO/NACA, 2009). Women account for a majority - about 57 per cent - of people living with HIV/AIDS. Just like Botswana, Lesotho has been experiencing declines in infection levels among young pregnant women, falling from 25 per cent in 2003 to 21 per cent in 2005.