The major factor contributing to the rapid rise in the number of new HIV diagnoses since 1999 has been the diagnosis of infections acquired through heterosexual contact in high prevalence areas, mainly Africa.
1999年以来艾滋病毒感染者人数迅速增加的主要因素，是在高发区通过异性性接触造成的感染，这种情况主要出现在非洲。