In November, a new coronavirus variant took the world by storm. Omicron has since caused an unprecedented wave of infections, striking about 90 million people in just 10 weeks. That’s more COVID ...

Thirteen of Omicron’s mutations should have hurt the variant’s chances of survival. Instead, they worked together to make it thrive. By Carl Zimmer As nurses and doctors struggle with a record ...

With Omicron cases on a rise worldwide, ... For the unversed, phlegm refers to the thick mucus that is secreted in your respiratory passages and discharged through your mouth.

SARS-CoV-2 has the ability to combine parts of previous strains, creating new variants. Here we describe a recombinant of two Omicron strains, given the preliminary designation Omicron BA.4.

The omicron strain of Covid-19 is at least 40% more lethal than seasonal flu, according Japanese scientists, underscoring the potential danger of lifting pandemic curbs too quickly and ...

Thousands of flights canceled. Back-to-the-office plans shelved. College football bowl games and Broadway shows called off. Shuttered Apple stores in New York City.

The Omicron variant could lead to more infections among vaccinated people, according to several scientists, but some said there were reasons to believe the shots would protect against severe disease.

Although Omicron caused sharp surges in cases across the globe, Hong Kong stands out grimly for its Covid-19 death rate. The city’s Covid death toll is among the highest recorded at any one time ...

COVID-19 vaccine candidates developed by a Sinopharm subsidiary and Sinovac Biotech to target the Omicron variant were approved for clinical trials in Hong Kong, the companies said on Saturday.

As the Omicron wave crests, there’s bad news and good news. The bad news is that the main strategies for slowing its spread—repeated testing, masks and vaccine boosters—are largely futile ...