A free HIV test at a center in New York city in June 2019

If lockdowns and stay-at-home orders are succeeding in slowing the spread of the coronavirus, health experts warn that the measures could unintentionally undermine efforts to contain another potentially deadly disease: HIV.

At the start of April, Travis Sanchez, an epidemiologist at Emory University, carried out an online survey of around 1,000 men who have sex with men, and half of them reported a drop in the number of sexual partners, as well as reduced use of hook-up apps.

In theory, this should reduce transmission.

But he