In a highly unusual decision, the C.D.C. director, Rochelle Walensky, reversed a move by agency advisers and endorsed additional doses of the Pfizer-BioNTech vaccine for health care workers, teachers and other workers at risk.
Author: Apoorva Mandavilli and Benjamin Mueller
Covid-19 Delta Variant Widens Gulf Between Vaccinated and Unvaccinated
Data from overseas, particularly Britain, suggest the spread of the virus will set vaccinated and unvaccinated communities on very different paths.
Virus Variants Threaten to Draw Out the Pandemic, Scientists Say
Declining infection rates overall masked a rise in more contagious forms of the coronavirus. Vaccines will stop the spread, if Americans postpone celebration just a bit longer.
Why Do Virus Variants Have Such Weird Names?
B.1.351 may sound sweet to a molecular epidemiologist, but what’s the alternative, other than stigmatizing geographical names?