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A comment on Current RNA vaccines protect against worrying coronavirus variants. Parent comment
https://www.nih.gov/news-events/nih-research-matters/lasting...
You don't have similar immunity efficacy studies for actual covid as hou have for vaccines, because infecting people on purpose would be unethical.
Note that your wording "coin flip" isn't right for Sinovac, either. 50 % efficacy is not huge but it is still beneficial on population level.
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https://www.nih.gov/news-events/nih-research-matters/lasting...
You don't have similar immunity efficacy studies for actual covid as hou have for vaccines, because infecting people on purpose would be unethical.
Note that your wording "coin flip" isn't right for Sinovac, either. 50 % efficacy is not huge but it is still beneficial on population level.