Pfizer says early analysis shows its Covid-19 vaccine is more than 90% effective
https://www.cnn.com/2020/11/09/health/pfizer-covid-19-vaccine-effective/index.html
The measles vaccine has a 90% successful rate and has stamped out measles in the USA
https://www.cnn.com/2020/11/09/health/pfizer-covid-19-vaccine-effective/index.html
The measles vaccine has a 90% successful rate and has stamped out measles in the USA