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NPR asked COVID-19 experts how we should keep weighing risk as we enter the fourth year of the pandemic.

Dr. Sumit Ray, critical care chief at a New Delhi hospital, is on the front lines of India's growing COVID-19 crisis. "As a system in different parts of the country, we have collapsed," he says.

Antibody tests may be coming soon to a pharmacy near you. Here's what the tests reveal — and don't reveal — about you and COVID-19.

The Department of Health and Human Services says it will require new vaccines to be tested against a placebo, which could complicate and delay Food and Drug Administration approval of many vaccines.

As the old New Yorker cartoon said, "On the Internet, nobody knows you're a dog." And if you're an online gamer, your opponents may not know that you're a 27-year-old white mother pretending to be a large, black male warrior.

How many people lived in the original 13 Colonies? How much do we import in American flags? The pressing questions to get you through July Fourth.

Scientists are beginning to come up with answers to the question of how long antibodies from an infection can protect you — and what they'll protect you from.

Adventurer Norman Vaughn, the last surviving member of Admiral Richard Byrd's 1928 expedition to the South Pole, turns 100 years old Monday. Heart surgery and age hasn't deterred him from planning his next adventure, back to Antarctica.

The 17-year-old pooch, Kabosu, reached global recognition after social media users turned her face into a viral meme and cryptocurrency branding. Her owner says she's in a "very dangerous condition."

With 60% of the state's population already covered by wastewater testing, Colorado is aiming to be a sentinel of coming contagion — not just of COVID surges, but of other types of diseases, too.