Silly people cite that these diseases were wiped out by vaccines, but the truth is they weren’t. They disappeared due to better hygiene, better sanitation and better food preparation. Diseases come and go as well throughout history. Some diseases have even been found in arctic ice samples. (Think of the arctic ice melting now, scary huh). The common denominator in diseases in hygiene, sanitation and food safety. Your less likely to get sick if all three of those conditions are good. Not any vaccine.