Both my sons were vaccinated but both caught measles when we lived in the Netherlands during the 70’s. The Dutch doctor who treated our kids said that vaccinations were not a guarantee against the disease. If you read the initial reporting of the outbreak at Disney, there were several vaccinated children who also got measles.
CDC says Measles Cases at Disney Came from Outside US
Here is an interesting website about the international cases of measles:
It just seems to me that this situation is being politicized in order to keep the Republicans on the defensive.