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How vaccine efficacy is determined? We can't test with real virus right?

vaccine efficacy

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#1 soulprogrammer

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Posted 18 April 2020 - 04:19 AM

How vaccine efficacy is determined?


Say after 100 people vaccinated, maybe after 3 weeks, then how can the vaccine efficacy is determined?


You can't risk human life and try to infect these 100 people with real virus and see if it works?


So, if we can't use real virus to test its efficacy on real human subjects, then how do we know the vaccine is working or not?



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