Not yet investigated
What we have so far
Chickenpox and shingles are the same virus decades apart, and the vaccine that prevents the second is the live one grown in the 1970s.
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.