I'm honestly surprised that something like this hasn't happened earlier.
Its happened before. The difference today is that there are actually rules and guidelines now such as mandatory testings n such.
Before it was fair game, no one bothered testing and if they did and were positive they really didn't HAVE to tell anyone.
I can't recall the name atm but there was a guy in the 70s/80s I believe that was pretty popular and contracted AIDS yet continued to perform with multiple women who had no clue.
It still is not 100% safe today but at least they try to contain it and minimize the problems .