Pfizer says South African variant could significantly reduce vaccine protection February 18, 2021February 17, 2021
The C.D.C. says tight-fit masks or double masking with cloth and surgical masks increases protection. February 10, 2021February 10, 2021
Covid-19 protection: CNN analysis suggests 12% — and as much as a third — of the US population might currently have some protection against Covid-19 January 28, 2021
New Playbook for Covid-19 Protection Emerges After Year of Study, Missteps January 26, 2021January 26, 2021