Zeynep Tufekci published an excellent article about this. Her thesis is that medical dogma insisted COVID (and other infections) spread through droplets and not aerosols. Social distancing is enough to prevent infection from droplets because they don't travel far. That, it turns out, is wrong, and COVID can spread through smaller respiratory particles that can float, making social distancing alone ineffective.

https://www.theinsight.org/p/the-few-sentences-that-explain-...