Quote:
Originally Posted by opendoor
That's what animal tests are for. They test both efficacy and safety in animals to come up with something that seems to work well and is safe, then they move onto human trials. Phase I/II trials are usually to figure out the safety and the most effective dosage. Once that's determined, Phase III trials determine efficacy in real-world conditions. We knew months ago that these vaccines produced antibodies; what we didn't know was whether the antibodies they produced would actually prevent infections (or at least prevent illness) on a wide scale. Now we have preliminary evidence that the Pfizer and Moderna vaccines are extremely effective at doing that. And that likely means others will be too.
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This is a great explanation of it ^^
For some additional info, I recommend this article on the Oxford/Astrazeneca process (it's a long read but worth it):
https://www.politico.com/news/magazi...ne-saga-412208