Data in China shows that the male to female ratio of infections has
changed dramatically in just a few years from 5:1 in the 1990s to
the current 2:1, in some areas, the ratio have reached 1:1.Most of
the recent infections in women have been sexually transmitted; some of
them belong to the high-risk group of prostitutes, while others are
just ordinary housewives or career women, infected by their husbands.