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Here's what we know about the effectiveness of vaccines for variants of concerns, notably the delta variant, first identified in India and now responsible for more than 20% of new U.S. cases.

Vaccine and booster side effects can include fever, aches and fatigue. And this may be the first vaccine in history where people complain if they don't experience side effects, says one doctor.

It was drummed into our brains: Stay 6 feet from others! Limit close contact to 15 minutes. With the highly contagious delta variant, do we need to rethink those numbers?

Answers to your COVID-19 questions about how to handle Halloween trick-or-treaters, whether it's safe to eat in a restaurant's outdoor bubble and whether you can be infected through your ear canal.

Apple and Google are developing smartphone technology to help fight the coronavirus pandemic. But public health authorities in some states are chafing against the tech giants' rules.

As researchers try to determine the severity of cases caused by the omicron variant, the question of what exactly constitutes mild, moderate and severe COVID is weighing on people's minds.

The quarantined are lonely — none of us could comfort her in person when she was locked down in her room. But we were determined to make it less frightening. That meant turning to food.

So, you've successfully scored a vaccine — or at least an appointment. Congrats! That's amazing news, seriously! Now what about those side effects? And do you have to keep up that double masking?

Also: If I head to a new state or country for a visit, do I need to self-isolate to protect others in case I'm contagious?

Some 7,000 volunteers were evacuated in an unprecedented callback. Back home and jobless, they're in limbo — but there's a proposal to enlist them in the fight against COVID-19.