1. Sharp PM, Hahn BH. Origins of HIV and the AIDS pandemic. Cold Spring Harb Perspect Med. 2011;1(1):a006841.
2. United States Department of Health and Human Services. https://www.getyourprep.com. Accessed 27 Feb 2020.
3. Hall HI, Song R, Szwarcwald CL, Green T. Brief report: time from infection with the human immunodeficiency virus to diagnosis, United States. J Acquir Immune Defic Syndr. 2015;69(2):248–51.
4. Centers for Disease Control and Prevention. Ending HIV transmission. https://www.cdc.gov/vitalsigns/test-treat-prevent/index.html. Accessed 27 Feb 2020.
5. Fox J, White PJ, Macdonald N, Weber J, McClure M, Fidler S, et al. Reductions in HIV transmission risk behaviour following diagnosis of primary HIV infection: a cohort of high-risk men who have sex with men. HIV Med. 2009;10(7):432–8.