Io9 has a chart from the CDC showing the number of measles cases in the US in recent years. There have been hundreds of cases so far this year. Many recent outbreaks seem to be associated with places (like schools) having unusually large numbers of unvaccinated people. Opposition to vaccines has been growing in recent years, with much of it ultimately due to discredited papers claiming a link between vaccines and autism. Even if that link were true (it’s not as far as anyone has been able to tell), vaccines save enormous numbers of lives every year. Vaccines don’t work for everyone, so a high vaccination rate is needed to prevent outbreaks from occurring. While one person can avoid vaccines without causing problems for everyone else, if too many do that you end up with the current situation where diseases that were nearly eradicated come back. So, in summary, get your vaccines and vaccinate your children.