Typically poor journalism. No report as to whether these deaths were documented by physicians as "mysterious." Where's the ME on this? I don't mean it isn't disconcerting, I just mean it's lousy hournalism - not enough facts.
This story has all the facts except the essential ones!
But, alas, par for journalistic course nowadays. Who, what, when, where and how are...so...like, y'know, twentieth century!