CNN Health

Jessie Festa was seated on an Alaska Airlines flight at Seattle-Tacoma International Airport waiting to take off for Pasco, Washington, when a flight attendant announced wearing masks during the flight was no longer required.

It's been more than a year since adults first got Covid-19 vaccines, but about 18 million children under 5 in the US are still waiting -- and will probably have to wait until the summer, despite some predictions that shots would be available in the first part of 2022.

Philadelphia will lift its mask mandate, less than a week after it was reinstated due to a rising Covid-19 case count.

The Perseverance rover just witnessed a unique kind of eclipse while sitting on the surface of Mars -- and the robotic explorer captured video of it.

An investigation continues into cases of acute hepatitis with unknown causes among children who had adenovirus infections.

Data published Thursday by the US Centers for Disease Control and Prevention shows that vaccination rates for three childhood vaccines fell in kindergartners in the 2020-21 school year compared with the 2019-20 school year, a "concerning" finding that may lead to more infections, a CDC immunizations expert said.

Just because incidents of political interference within the United States' top health agencies are not reported, does not mean they don't happen, a new federal report finds.

A new year-long randomized clinical trial found no significant difference in weight loss between time-restricted eating and simple calorie counting.

If you spot a shooting star in the night sky later this week, it might be from the Lyrid meteor shower, which will reach its peak overnight around 12 a.m. ET on April 22, according to EarthSky.

Gender-affirming care is medically necessary, evidence-based care that uses a multidisciplinary approach to help a person transition from their assigned gender -- the one the person was designated at birth -- to their affirmed gender -- the gender by which one wants to be known.

The role that the federal government plays in containing future epidemics will hinge on the outcome of an appeal of this week's court ruling that overturned the mask mandate for travelers on airlines, trains, and the nation's mass transit systems.

Our Stone Age ancestors didn't just share stories by the side of a fire -- they may have watched them too.

The thousands of decisions people make each day can leave them feeling drained. Learn how to make smarter choices using less energy.

Although a federal judge struck down the Biden administration's mask mandate for public transportation Monday, some experts say you don't want to throw out your mask just yet. No matter the form of public transportation -- planes, trains, trams, subways, buses or even rideshares -- good ventilation can help reduce the spread of Covid-19, but masks work best.

The US saw the highest number of "very unhealthy" and "hazardous" air quality days between 2018 and 2020 than it ever had before, according to a report released Thursday by the American Lung Association.

The Florida Department of Health is advising against any gender-affirming care for children and adolescents in new guidelines that are contrary to direction from major medical associations and federal health officials.

Taylor Swift has countless Grammys and American Music Awards, but this new honor will be a first for the global pop star.

When Delta Air Lines referred to Covid-19 as an "ordinary seasonal virus" after a federal judge struck down the Biden administration's mask mandate for public transportation, they were partly right: there is some evidence that it is seasonal. But it is far from ordinary, and it's still not the same as the flu.

Vaccine advisers to the US Centers for Disease Control and Prevention continue to mull over what the future of Covid-19 booster shots might look like -- and they acknowledge that entirely different vaccine formulations could be needed.

Pterosaurs ruled the skies during the age of the dinosaurs, but scientists have long debated if they actually had feathers.