Will Stone

For a year, researchers have been studying and arguing over vitamin D's potential for helping protect against or treat COVID-19. The evidence is still not conclusive.

Pausing use of the Johnson and Johnson vaccine looks unlikely to cause major problems in the overall U.S. vaccination effort, but some places counting on those doses are scrambling.

Get the first vaccine you're offered: that's the public health message. Each COVID-19 vaccine is highly effective at preventing severe disease, but some Americans want to choose the vaccine they get.

At least a dozen states have now seen an increase in COVID-19 hospitalizations. Epidemiologists explain what they think is behind the potential fourth surge of the pandemic in the U.S.

The possibility that vaccines meant to prevent the disease may also be a treatment for long COVID — when symptoms linger for months — has sparked optimism among patients and scientists.

An estimated 10% to 30% of people who get COVID-19 don't fully recover, but have chronic symptoms. Now some of these "long-haulers" are finding relief after getting the COVID-19 vaccine.

Researchers have quantified the price paid for fast-spreading COVID-19 infections. Patients who might have survived otherwise perished in crowded ICUs.

The Aldaco family of Phoenix suffered more than most in this year of unfathomable losses. Three brothers perished in the pandemic: Jose in July, Heriberto in December and Gonzalo in February.

As the new Johnson & Johnson COVID-19 vaccine rolls out, the health care community is trying to ward off misconceptions about it. The vaccine's one-shot feature may be what wins many over.

People in a diverse Seattle neighborhood consider the new Johnson & Johnson vaccine, particularly who is and isn't getting it and why.

Federal agents and others have seized more than 11 million counterfeit masks, including the N95 masks used in hospitals. What are some indicators of a fake mask?

The country has beat back the winter surge, and experts credit Americans' improved compliance with precautions like mask-wearing. But we could we still face a resurgence if we let up.

The pandemic is hitting some families harder than others. In Arizona, one family lost three members to COVID-19.

Coronavirus infections, deaths and hospitalizations are down about 30%. Behavior, immunity and the end of the holidays could all be helping. But with new variants, some fear this may be short-lived.

Seattle is trying to ensure equitable access to vaccines by setting up clinics in communities of color. Nationwide, not all jurisdictions even track racial and ethnic data about vaccine distribution.

Glitchy websites, jammed phone lines and long lines outside clinics are complicating the vaccine rollout. And older Americans and those without caregivers and computer skills are at a disadvantage.

COVID-19 has now killed more Americans than WWII. That fact helps some people put the viral death toll in perspective, while others find it offensive. Historically, is it even a valid comparison?

People 65 and older are priortized for vaccinations, but it's not always obvious how they should find a place to actually get a site. Efforts to help them are a hodgepodge nationwide.

Large corporations such as Starbucks, Honeywell, Microsoft, Costco and Google want to help states with planning and logistics. But the potential of these partnerships is hindered by supply problems.

In the U.S., deaths from COVID-19 has surpassed the toll of American deaths from World War II. But comparing death tolls is morally fraught, and oversimplifies history.