Many years ago I worked in a travel clinic advising people about the immunizations they needed before visiting other countries. Sometimes shots were required for entry into a country, such as the yellow fever vaccine. But we also made sure that MMR (measles-mumps-rubella) and other vaccines were up-to-date. The reason was that while immunizations have been very successful in getting rid of measles (and other childhood illnesses) in the US, many countries still have outbreaks. The booster shots were not necessary in the US because we no longer had cases of measles. Until now.
We are seeing cases of measles (and other childhood illnesses) again because parents are increasingly refusing to get their kids vaccinated. The current outbreak of measles in California is causing a lot of public debate about how to force people to get their kids vaccinated. While we may need to find new ways to enforce vaccination, we also need to restore trust – people increasingly don’t trust doctors, pharmaceutical companies, government agencies or payers.