Raise your hand if you know someone who has herpes. Yup, thought so.
And for the first time ever, scientists have given an official estimate of just how many people around the globe are afflicted with this super-common STD. On Wednesday, the World Health Organization (WHO) released a report published in the journal PLoS One stating that a whopping two-thirds of the world's population under 50 (we're talking 3.7 billion people here) have the herpes simplex one virus (HSV-1).