"Pfizer said there were 170 cases of COVID-19 in its trial of more than 43,000 volunteers and only eight people with the disease had been given the shot rather than a placebo, meaning the vaccine had a 95% efficacy rate. Of the 10 people who developed severe COVID-19, one had received the vaccine."
These numbers do not make sense: out of 43,000 volunteers only 170 got COVID-19 or just one in ~250 in a 4 months trial? Are these people were quarantined?
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