Pfizer and BioNTech claim their Covid-19 vaccine shows better than 90% effectiveness–but there is no hard data to back this up. With the sales pitch, we need a “Certain Restrictions Apply” caution.
Pfizer and BioNTech claim their Covid-19 vaccine shows better than 90% effectiveness–but there is no hard data to back this up. With the sales pitch, we need a “Certain Restrictions Apply” caution.