Health Jan 18

The fast-moving omicron variant may cause less severe disease on average, yet COVID-19 deaths in the U.S. are climbing. Modelers forecast 50,000 to 300,000 more Americans could die by the time the omicron wave subsides this spring.

Science Jan 10

Friday's surgery showed for the first time that a gene-edited animal heart can function in the human body without immediate rejection.

Health Dec 31

U.S. health officials say early data suggests they may be less sensitive at picking it up.

Health Dec 28

The U.S. flu season has arrived on schedule after taking a year off.

Health Dec 17

The delta and omicron variants of the coronavirus are trying to spoil the holiday spirit, but there still are ways to enjoy the festivities.

Health Dec 15

Omicron, even if it proves milder on the whole, may disarm some of the life-saving tools available and put immune-compromised and elderly people at particular risk as it begins a rapid assault on the United States.

Health Nov 30

After a slow start, the United States has improved its surveillance system for tracking new coronavirus variants such as omicron, boosting its capacity by tens of thousands of samples per week since early this year. Viruses mutate constantly. To find…

World Nov 01

The United States, the European Union, Britain and Brazil account for one-eighth of the world’s population but nearly half of all reported deaths.

Health Sep 24

Millions of Americans are now eligible to receive a Pfizer booster shot to help increase their protection against the worst effects of the coronavirus. Boosters are free and available at health departments, clinics and drugstores.

Health Sep 20

COVID-19 has now killed about as many Americans as the 1918-19 Spanish flu pandemic did — approximately 675,000. And like the worldwide scourge of a century ago, the coronavirus may never entirely disappear.