From the Pfizer literature, the 90% effectiveness comes from looking at 94 patients out of a 43,444 study. That means they examined 0.2% of the people in the study to see if the vaccine met their criteria. The article states: "The study also will evaluate the potential for the vaccine candidate to provide protection against COVID-19 in those who have had prior exposure to SARS-CoV-2, as well as prevention against severe COVID-19 disease."
With a disease with close to a 99% survival rate, an over 90% effective vaccine would do what to the survival rate if the vaccine hasn't been tested to prevent a severe case of COVID-19? Would it even do anything? I sure hope that using 0.2% of the people in the study is sufficient. The study covers about 154 countries and we have no idea which countries the 94 people come from. Pfizer did what they had to do to get a vaccine to market, but it is far from optimal science. Lets pray it helps.
With a disease with close to a 99% survival rate, an over 90% effective vaccine would do what to the survival rate if the vaccine hasn't been tested to prevent a severe case of COVID-19? Would it even do anything? I sure hope that using 0.2% of the people in the study is sufficient. The study covers about 154 countries and we have no idea which countries the 94 people come from. Pfizer did what they had to do to get a vaccine to market, but it is far from optimal science. Lets pray it helps.
