Polio is a enterovirus. Naw, it can't be Polio because Polio is eradicated right? Interesting comment I ran across a couple of days ago:
SHORT-LIVED WHOOPING COUGH (ACELLULAR PERTUSSIS) VACCINES ARE CAUSING THOUSANDS OF VACCINATED KIDS TO GET SICK WITH EPIDEMIC OUTBREAK OF ENTEROVIRUS 68
When you kill the Alpha pathogen that was keeping a pack of lesser bugs under control, you unleash a Pandora's Box of mutated strains, and the formerly lesser pathogens become increasingly virulent.