Chemsex and PrEP fuel syphilis in MSM

By the 1980s syphilis was virtually eradicated from the UK. But it’s back and spreading quickly. The UK is now seeing thousands of new cases of the disease every year, rising by 148% since 2008 in England alone. This time, most new cases are among men who have sex with men (MSM). Simon Bishop of Bangor  University explains.