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Plus: Is it safe to go to a holiday party if not everyone is vaccinated? And are people getting different side effects from the COVID booster?

The Centers for Disease Control changed its guidelines for isolation and quarantine during this pandemic. Not everyone is sure how to define those terms. Also, not everyone is 100% behind the changes.

We answer key questions about COVID tests: What types are there? Should you self-test right after exposure to someone with COVID? And what should you do if you test positive?

Pandemic predictions have been made — and then things would change. But based on models and studies (including a 1980s test that squirted virus up human noses), researchers have a new endgame thesis.

Does a booster shot mean that you can return to your old normal? Or is there still a newish kind of normal to face?

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 International Atomic Energy Agency and Iran reached a deal to reinstall cameras damaged at centrifuge plant, after the IAEA said restrictions gave a "blurred image" of Iran's nuclear program.

More retailers are striking deals with delivery companies like Uber, DoorDash and Instacart to get online orders to shoppers within hours.

To block a variant this transmissible, scientists say you need an N95 or other high-filtration mask. Here's how to find a good one and when to wear it.

Lan Samantha Chang's novel "The Family Chao" has a lot in common with Dostoevsky, except it revolves around a Chinese-American family in Wisconsin. Chang discusses the new work with Scott Simon.