Polio has exploded back into Americans' consciousness after being out of the spotlight in the U.S. for half a century or so: In late summer, it paralyzed an adult in New York state, and the poliovirus has been detected in New York City's wastewater. This week on the "First Opinion Podcast," doctors Sallie Permar and Jay Varma make the case that pediatricians are the frontline for fending off this "old foe," but they need help.