Hepatitis C is a two-timer. Unlike HIV, the virus that causes hepatitis C can be cleared from the body through treatment. But it can return.

That’s what happened to six HIV-positive men in Britain late last year. They were found to be reinfected with new strains of hep C after successfully clearing a first infection. What’s more, all six contracted the new cases through sex.

If you’ve gone through hep C treatment, you already know: Once is more than enough.