Bubonic plague comes and goes even till this day. F­u­c­k, those squirrels that you see running around at camp grounds carry the shit. So do chipmunks. They closed a campground about 20 minutes from me because a ground squirrel was found to be carrying the plague. Though with modern medicine the plague is no where near as lethal. We've had hundreds of years dealing with that shit. We know how to combat it, hell, we even know of a gene that blocks it from attacking cells. The next super bug will be something new. Maybe a new form of the flu or something. Viruses like the Plague, Smallpox, and Spanish Flu have run their course and we learned a lot from combating them.