Not yet investigated
What we have so far
Your immune system answers a new flu with the antibodies it made for the first one you ever met, in childhood. It shapes every response you will have for life.
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.