We’ve all heard of the usual suspects when it comes to STIs, from chlamydia and syphilis to gonorrhoea and herpes. But we’ll take a guess and say you haven’t heard of this lesser-known bug, which is ...

(koto_feja/E+/Getty Images) A gut pathogen that causes diarrhea and vomiting is morphing into a dangerous and difficult-to-treat sexually transmitted infection (STI). In the United States, roughly 450 ...