Not yet investigated
What we have so far
The antibody titre that means 'protected'. For measles it is known and precise; for many vaccines it has never been established, which is why boosters are argued about.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.