When it was time for my first child's measles vaccine (1979), our pediatrician was emphatic when he told me the combined MMR was not safe. It made sense to me, when he stated that since a child would not get the three viruses at the same time, the vaccines should not be given at the same time. Instead, he administered the three vaccines individually a few months apart. Unfortunately, the belief at the time and his assurance that one vaccine would produce lifelong immunity like the natural measles virus that I had as a child, proved not to be true. Although I didn't realize it at the time, that pediatrician planted the seed in me which, almost ten years later when I was expecting my third child, launched me into a more thorough investigation of vaccine safety and efficacy and ultimately led me to become an advocate for vaccine risk awareness and vaccine choice.
In the video below, Dr. Andrew Wakefield, who has been studying the measles virus since 1990, explains that primary, secondary and tertiary failure of the MMR vaccine -- and not the unvaccinated -- could very well be responsible for measles outbreaks. Dr. Wakefield's warnings are very much in keeping with the several studies cited in the PIC documents below and in "The Future of Measles in Highly Immunized Populations A Modeling Approach" published in 1984.
Dr. Wakefield's segment begins at approximately minute 32.
For more detailed information on the measles virus and MMR vaccine failure, listen to Dr. Wakefield's 2019 Autism One presentation, "Man, Measles, and Make-believe"; and please read the just published "The Sixth Extinction: Vaccine Immunity and Measles Mutants in a Virgin Soil" by Andrew J. Wakefield, M.B.