World Health Organization, 6 September 2016
This document is an update of guidance published on 7 June 2016 to provide advice on the prevention of sexual transmission of Zika virus. The primary transmission route of Zika virus is via the Aedes mosquito. However, mounting evidence has shown that sexual transmission of Zika virus is possible and more common than previously assumed. Based on this new evidence, the recommended length of time for safer sex practices for asymptomatic males returning from areas with active Zika virus transmission was extended from 8 weeks to 6 months.