With misinformation and disinformation, vaccination rates for measles are worryingly down, and other serious — though vaccine-preventable — diseases are also showing up, among them, whooping cough, rotavirus, meningitis and serious cases of influenza. Doctors are also concerned about the reemergence of polio. In the United States, there were more cases of measles last year than in any other year since the virus was declared eliminated in 2000, a status the country is now poised to lose.