That has not been established. You are referring to a preliminary study that has not been peer reviewed. See: https://www.independent.co.uk/news/world/americas

That has not been established. You are referring to a preliminary study that has not been peer reviewed. See: https://www.independent.co.uk/news/world/americas/us-politics/fauci-moderna-pfizer-delta-variant-b1903301.html https://www.independent.co.uk/news/world/americas/us-politic...