| hiv-1 discordant couples in karnataka, south india: is the sex ratio of index cases changing? | india has an estimated 2.5 million hiv infections, most of which are heterosexually transmitted. women comprise 40% of infected adults. in india, 90% of women between the ages of 15 and 45 years are married. previous literature has suggested that sexual intercourse with an hiv-infected husband represents a married woman's greatest risk for being infected. however, a recent meta-analysis of discordant couples from sub-saharan africa reported that women were the index case in half of all couples. ... | 2012 | 22844005 |