Both theory and data overwhelmingly support delaying second doses in favor of getting first doses to more people, e.g. https://marginalrevolution.com/marginalre

Both theory and data overwhelmingly support delaying second doses in favor of getting first doses to more people, e.g. https://marginalrevolution.com/marginalrevolution/2021/02/first-doses-first-the-data-is-arriving.html https://marginalrevolution.com/marginalrevolution/2021/02/fi.... Notably, the "recommended" 3 week delay wasn't the result of determining the medically optimal interval; it was chosen to reduce the time needed for vaccine trials.