The Centers for Disease Control and Prevention listed the COVID-19 delta variant as one of its "variants of concern" (VOCs) on June 15. According to the CDC, VOCs can be more contagious, more ...

The XFG COVID-19 variant, aka "Stratus," is spreading rapidly in the U.S. as cases climb. Here's what to know about symptoms ...

Experts at Johns Hopkins and across the country work together to better understand the behavior and characteristics of ...

As evidence mounts that the omicron variant is less deadly than prior COVID-19 strains, one oft-cited explanation is that viruses always evolve to become less virulent over time. The problem, experts ...

SAN FRANCISCO -- A new variant of the coronavirus that has been spreading through the UK and other countries has not yet been detected in the United States, according to the CDC. But that doesn't mean ...

The trajectory of Covid-19 symptoms from 2020 to 2025 illustrates a fascinating evolution influenced by both viral mutations and the population's immunity. 2020: The Wuhan strain primarily caused high ...

US health secretary Robert F. Kennedy Jr. has announced he is canceling US $500 million (£374 million) of research into mRNA vaccines, citing unproven concerns about their safety and long-term effects ...