ERRATA CORRIGE Andrea Savarino, ISS 29 March 2010 I am sorry I noticed the following errors in the published version of the manuscript: Additional file 1: Please erase from caption: “the highly conserved catalytic residues D64, D116 and E152 (presented in yellow) and”. Abstract: “Tenofovir disoproxil fumarate” should read, simply, "tenofovir". Background, fourth paragraph: Again, please do not consider “disoproxil fumarate”. Caption of Figure 2: Sixth line: Please do not consider “pro-drug”. Seventh line:“Tenofovir disoproxil fumarate” should read, simply, "tenofovir". Methods section "Nonhuman primate studies": “50 mg/kg/BID or 100 mg/kg/BID” Please do not consider “/kg/” thus it should read as: “50 mg BID or 100 mg BID”. Andrea Savarino, M.D. Department of Infectious, Parasitic and Immune-mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, 00161, Rome, Italy. firstname.lastname@example.org Competing interests We have no competing interests.