Heffron R, Donnell D, Rees H, Celum C, Mugo N, Were E, de Bruyn G, Nakku-Joloba E, Ngure K, Kiarie J, Coombs RW, Baeten JM; Partners in Prevention HSV/HIV Transmission Study Team.
An October 2011 analysis by a group of researchers, led by Renee Heffron of the University of Washington and published in Lancet Infectious Diseases, found two-fold increases in the risks of both HIV acquisition and HIV transmission among women in HIV-discordant couples using hormonal contraceptives, particularly the progestin-only injectable, compared with women not using hormonal contraceptives.