Although antiretroviral drugs can lower the chances of mother-to-child HIV transmission to virtually zero, one group of women remains at risk of infecting their babies'those coinfected with hepatitis C. A study of 1,050 women HIVers has shown that those coinfected with hepatitis C were twice as likely to have detectable viral loads during the third trimester of pregnancy or during delivery'even among those taking antiretrovirals'significantly boosting vertical transmission risks.
