As far as I know, they don't inject people in the trial with Covid, instead they wait long enough and use statistics to asses how many should have gotten Covid by now and if they didn't attribute it to the vaccine working.
Since healthy young people are more likely to get Covid, it might be this is the fastest avenue to knowing how effective the vaccine is.
But I am not a doctor or infectious disease expert or vaccine researcher.
Since healthy young people are more likely to get Covid, it might be this is the fastest avenue to knowing how effective the vaccine is.
But I am not a doctor or infectious disease expert or vaccine researcher.
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