I have skipped huge chunks of this thread (I'm sorry) but wanted to tell my tale.
I had the MMR, fully vaxed and thought it had worked as when i had my rubella immunity status checked when pregnant it came back as immune both times.
Then i had my immunity checked recently by occupational health, just because i didnt have my MMR cert on the day. I am not immune to either Measles or Mumps. So i have to have another MMR.....they will then assume I am immune as I will have a cert and never screen me again
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Several colleagues seem to have got no TB immunity despite having had BCGs.
It worries me that we rely on vaccines, assume you must be immune if you are vaccinated, and it is only unvacinated people who are spreading diesease. All (4) children I know who have had measles had been vaccinated, which was why it wasn't recognised straight away.