The Coronavirus Has Infected More Than Half of Americans, the C.D.C. Reports

Sixty percent of Americans, including 75 percent of children, had been infected with the coronavirus by February, federal health officials reported on Tuesday — another remarkable milestone in a pandemic…

F.D.A. Allows Second Coronavirus Boosters for Everyone 50 and Older

WASHINGTON — Federal regulators authorized second booster shots of the Pfizer-BioNTech and Moderna coronavirus vaccines on Tuesday for everyone 50 and older, describing the move as an effort to bolster…

Moderna to Seek Authorization of Its Coronavirus Vaccine for Young Children

WASHINGTON — Moderna said on Wednesday that it would seek emergency authorization of its coronavirus vaccine for children younger than 6, after interim results from its clinical trial showed that…

The use of at-home coronavirus tests jumped during the Omicron wave, but disparities remain, a survey suggests.

The use of at-home coronavirus tests surged during the winter Omicron wave in the United States, with white, high-income and highly educated people most likely to report using the tests,…

Which Coronavirus Vaccine Will Work in the Youngest Children?

WASHINGTON — Over the past 10 months, as tens of millions of children and teenagers received the Pfizer-BioNTech vaccine, the companies’ main rival, Moderna, sat on the sidelines, its shot…

With a Flurry of High-Profile Coronavirus Cases, Washington Is Again on Edge

The speaker’s office confirmed that Ms. Pelosi, who is vaccinated and boosted, had received a negative P.C.R. test result on Thursday morning, and would continue to test regularly and follow…

Here’s how the coronavirus steals the sense of smell.

Few of Covid-19’s peculiarities have piqued as much interest as anosmia, the abrupt loss of smell that has become a well-known hallmark of the disease. Covid patients lose this sense…

How the Coronavirus Steals the Sense of Smell

Few of Covid-19’s peculiarities have piqued as much interest as anosmia, the abrupt loss of smell that has become a well-known hallmark of the disease. Covid patients lose this sense…

The coronavirus may be evolving in deer, two studies suggest.

Scientists have identified a new, highly mutated version of the coronavirus in white-tailed deer in southwestern Ontario, one that may have been evolving in animals since late 2020. They also…

New Coronavirus Lineage Discovered in Ontario Deer

Scientists have identified a new, highly mutated version of the coronavirus in white-tailed deer in southwestern Ontario, one that may have been evolving in animals since late 2020. They also…