this was one of the major causes of the polio epidemic. after the discovery of germs, parents stopped letting their babies get exposed to dirt and germs when th

this was one of the major causes of the polio epidemic. after the discovery of germs, parents stopped letting their babies get exposed to dirt and germs when they were young and still had their placental super immune system. This meant they didn’t develop resistance to Polio and other diseases, and were much more susceptible to it at an older age