We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleVirologic failure of protease inhibitor-based second-line antiretroviral therapy without resistance in a large HIV treatment program in South Africa.AuthorsLevison JH; Orrell C; Gallien S; Kuritzkes DR; Fu N; Losina E; Freedberg KA; Wood RPublicationPloS one, 2012, Vol 7, Issue 3, pe32144ISSN1932-6203Publication typearticleDOI10.1371/journal.pone.0032144