"Nature" про маски (link):
"To be clear, the science supports using masks, with recent studies suggesting that they could save lives in different ways: research shows that they cut down the chances of both transmitting and catching the coronavirus, and some studies hint that masks might reduce the severity of infection if people do contract the disease."
"But such studies do rely on assumptions that mask mandates are being enforced and that people are wearing them correctly."
Перевод абзацев – под катом. ( Collapse ).
Ну и про ограничения эффективности, само собой.