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. Author manuscript; available in PMC: 2016 Dec 10.
Published in final edited form as: J Control Release. 2015 Aug 24;219:669–680. doi: 10.1016/j.jconrel.2015.08.042

Fig 1. Approximate timeline for establishing HIV infection after vaginal exposure to HIV[3].

Fig 1

This timeline suggests a window of opportunity for PrEP therapy. Given the difficult logistics of diagnosing and initiating treatment immediately post transmission, PrEP delivers effective drug concentrations for at risk populations prior to exposure (adapted from [3]).