One of the requirements of graduate school in the US stumped me: an immunization certificate for the MMR vaccineWhen I enrolled in graduate school at the age of 53, I knew I would probably be the oldest student in class. But I was stumped by one of the admission requirements – an immunization certificate for the measles, mumps and rubella (MMR) and tetanus vaccines, verified by a doctor.Fortunately, I had my mother’s handwritten documentation of my vaccines and took this to my primary care physician. “Beautiful,” she said, admiring the yellowed paperwork, which noted one measles vaccine when I was 13 months, the other at 10 years. “But these aren’t official records, so you need a titer test.” A what? Continue reading...