Daniel Summers: Donald Trump and Robert F. Kennedy Jr. just made pediatricians’ jobs a lot harder

If enough parents refuse to have their children vaccinated, the herd immunity that protects the nation as a whole will wane. There were a record number of measles cases in 2014, the majority in people who were unvaccinated. Does anyone want to share the experience of the Spanish parents whose unvaccinated son died of diphtheria in 2015, after that country had been free of the disease since 1986?