Not yet investigated
What we have so far
A harmless virus carrying someone else's gene. Prior immunity to the vector can blunt the dose, which is why some use a chimpanzee adenovirus nobody has met.
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.