Some experts worry they may be too little, too late.
Author: Lauren McCarthy
The W.H.O. lists Mu as a ‘variant of interest.’
The variant, first identified in Colombia, has characteristics that suggest it might be able to evade antibodies from vaccination or infection.
U.S. Shifts Tactics Against Virus in Days With Mask Guidance
Delta-driven surges are prompting new measures from the federal government, states and cities, companies and the military, as well as defiant rejections.
Los Angeles Schools Will Test All Students and Staff for Covid
The shift by the second-largest U.S. district comes weeks before in-person classes are scheduled to resume.
Biden Details Covid-19 Action Plan
The president is encouraging paid time off to get vaccinated and other incentives to combat Covid-19 infections.