A single subvariant is not gaining all of the new mutations, however. Ben Murrell, a computational biologist at the Karolinska Institute in Stockholm, and...
Federal health officials expressed optimism on Tuesday that the nation was better prepared to weather a surge of Covid-19 infections this winter compared with...
As winter looms and Americans increasingly gather indoors without masks or social distancing, a medley of new coronavirus variants is seeding a rise in...
The emergence of highly contagious Omicron subvariants this spring in the United States appeared to reduce the protection offered by vaccines against Covid hospitalizations,...
Moderna’s coronavirus vaccine elicits a strong immune response in children aged 6 to 11, researchers reported on Wednesday — another signpost in what has...
In early 2021, scientists in Colombia discovered a worrisome new coronavirus variant. This variant, eventually known as Mu, had several troubling mutations that experts...
China’s leader, Xi Jinping, waved at crowds of giddily cheering students. He held meetings with Olympic Games officials, economic policymakers and European leaders. He...
The coronavirus vaccine made by Pfizer-BioNTech is much less effective in preventing infection in children ages 5 to 11 years than in older adolescents...