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The U.S. health care system is again buckling under the weight of a COVID-19 surge that has filled more than 100,000 hospital beds nationwide and forced some states to consider enacting "crisis standards of care" — a last resort plan for rationing medical care during a catastrophic event.

The delta variant is everywhere. Here's how well experts feel the vaccines and our immunity are working against it right now.

Some vaccinated people who develop breakthrough cases of covid-19, the illness caused by the virus, are learning a mild case may not seem so mild to the person enduring the infection.

More than 180,000 children have caught COVID over the past month, but the risk of severe disease appears to still be rare.

To prevent the next pandemic, scientists don’t need a definitive answer about the genesis of Covid-19. Regardless of how the coronavirus outbreak started, researchers say the world urgently needs to do more to prevent both lab leaks and so-called “spillover” infections from animals.

The U.S. is projected to see nearly 100,000 more COVID-19 deaths between now and Dec. 1, according to the nation’s most closely watched forecasting model. But health experts say that toll could be cut in half if nearly everyone wore a mask in public spaces.

An array of activists, scientists and politicians said Wednesday that the Biden administration’s inconclusive report on the origins of the coronavirus pandemic demonstrates the need for further probes, even if that leads the United States into delicate geopolitical territory.

When Covid-19 vaccines were reported last fall to be roughly 95% effective at preventing symptomatic Covid-19 infections, the world rejoiced — and even veteran scientists were blown away. Very few vaccines are that protective. Now, however, our soaring expectations for Covid-19 vaccines are in the process of sinking back to earth.

The delta variant has led to an increase in coronavirus cases in the United States. Here's when experts say fully vaccinated people should get tested.

As COVID-19 vaccination numbers slowly rise amid the spread of the delta variant of the virus, breakthrough cases of those who were previously vaccinated have continued, resulting in some hesitant to get vaccinated to further doubt the vaccines.

The Food and Drug Administration has given full approval to the Pfizer-BioNTech COVID-19 vaccine on Monday. This could help convince people who may have resisted the vaccine and lead to more mandates.

Is school safe? Soccer? Birthday parties? Doctors suggest some principles to guide decision-making for parents with unvaccinated children.