Nigeria and other African nations need to provide comprehensive health care, including antiretroviral medications, to HIV-positive people at no cost in order to prevent treatment interruptions and drug resistance, Medecins Sans Frontieres said on Tuesday at a news conference, Reuters reports. MSF this week at the 14th International Conference on AIDS and Sexually Transmitted Infections in Africa in Abuja, Nigeria, released a study that surveyed 122 HIV-positive patients who came to an MSF clinic in Lagos, Nigeria, after receiving treatment from other clinics or hospitals.