Trends and determinants of Comprehensive HIV and AIDS knowledge among urban young women in Kenya.

Background: Sub-Saharan Africa remains the region most heavily affected by HIV. In 2008, the region accounted for 67% of HIV infections worldwide, the region also accounted for 72% of the world's AIDS-related deaths in 2008. Young people aged 15-24 years accounted for an estimated 45% of the new HIV infections.