This sounds like one of those stories you hear on the playground. You know, the ones like, "Yeah, Bruce Lee once punched this guy in the chest, pulled out the guy's heart and showed it to him before he died."
So, now there's, "This guy had seven lizards. He died and they ate him..." And you always have to embellish these urban legends (although the story about the lizards is true) with something like, "These were Killer Mexican Lizards, and all lizards in the U.S. now are related to them. They act normal until they sense you're sick. Then they pounce, man! So don't get near them if you have a cold or anything."