Claims that a Harvard study showed COVID-19 vaccines are ineffective misrepresent the authors’ conclusions, fail to account for the study’s limitations
Drawing conclusions from population-level data is extremely complex and prone to bias and spurious associations. For this reason, the lack of correlation between the vaccination levels and the rate of SARS-CoV-2 infections in different countries and regions can’t be interpreted as evidence that COVID-19 vaccines are ineffective. Although COVID-19 vaccines aren’t 100% effective, multiple scientific studies show that they reduce the risk of infection and are highly effective against severe COVID-19 and death.