London, UK. 7th July 2016. ACT UP London, I Want Prep Now, National AIDS Trust, Terence Higgins Trust, Out and Proud Diamond Group and others protest outside the Dept of Health in Whitehall calling for the NHS to provide Pre exposure prophylaxis (PrEP) which is almost 100% effective in preventing HIV transmission. A protester chalks the message 'PrEP NOW' on the pavement ouside the Dept of Health '. Peter Marshall/Alamy Live News

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