TO ALL ENLISTED : THE MEASLES VACCINES ADMINISTERED IN THE 1960'S, INCLUDED A DEFECTIVE VERSION THAT DIDN'T WORK :

https://www.healthline.com/health-news/some-adults-need-to-be-revaccinated-against-measles-021115#5

IT IS BEST TO GET THE COMPLETE MMR ONCE AGAIN, IF IN DOUBT.

THE SECOND SHOT MUST BE ADMINISTERED 28 DAYS, FROM THE DATE OF THE FIRST MMR INJECTION.