Computer image of Human Papilloma virus - type 16

Where do STIs originate?

How did the first person catch an STI if no one else had it?

When I give talks on Sexually Transmitted Infections (STIs) to young people, this is one of the commonest questions. If an STI is only ever caught from someone else with an STI, logically we find ourselves asking where it all began. How did the first person catch an STI if… Read more.