UNAIDS estimates that in Cambodia, a country with Asia's highest adult HIV prevalence, 300 000 children lost their parents to AIDS related illnesses in 2006. The battle against AIDS in Cambodia, a country with Asia's highest adult HIV prevalence, has been hailed a success story. Due to increasing mortality in the existing HIV infected population and effective health programs creating a decline in new HIV infections, prevalence among the national adult population dropped from 3.3% in 1997-98 to 1.9% in 2003.