CDC Report: SARS-CoV-2 transmission to masked and unmasked close contacts of university students with COVID-19.

SARS-CoV-2 Transmission to Masked and Unmasked Close Contacts of University Students with COVID-19 — St. Louis, Missouri, January–May 2021 – CDC Morbidity and Mortality Weekly Report

Commentary on Twitter

https://twitter.com/eliowa/status/1436017429927370758