What does COVID-19 vaccine effectiveness mean? Effectiveness numbers will change as the vaccine studies continue since the early calculations were based on fewer than 100 COVID-19 cases in each study. But early results provide strong signals that the vaccine could prevent a majority of disease when large groups of people are vaccinated. For both vaccines, the interim results were based on people who had COVID-19 symptoms that prompted a virus test. Loading... Loading... Loading... Loading... Loading... Loading...

Source: thestar November 16, 2020 21:33 UTC