CNN Health

As more than 100 million Americans have received Covid-19 vaccines, experts are calling on the federal government to set standards for vaccination "passports" that may serve as proof.

The highly contagious Covid-19 variant first identified in the UK has now been reported in every state in the US, and experts are concerned spreading variants could send cases surging.

CNN Medical Analyst Dr. Leana Wen explains why cases among young people are rising and what precautions we all still need to take and why.

The practice of finding new uses for old medications -- called repurposing or repositioning drugs -- is not new.

"The Addiction Inoculation" author Jessica Lahey shares why the adolescent brain is especially vulnerable to alcohol and drugs, how adults can all support kids to make better decisions when it comes to alcohol and drug use, and how her own sobriety inspired the book.

Jessamyn Smyth hopes that two shots in the arm may be what finally delivers her from a year in which the lasting effects of Covid-19 wreaked chaos in her life.

With summer around the corner and more people getting Covid-19 vaccines, you may be wondering whether going to the beach is a safe bet.

The Ingenuity helicopter survived its first night on the freezing-cold surface of Mars, a major milestone in the rotorcraft's journey ahead of its historic first flight.

Successfully tackling your morning to-do list could start with the first thing you put in your mouth.

When the coronavirus pandemic began, the challenge for Pfizer and BioNTech wasn't just developing a Covid-19 vaccine -- they also had to make it, and by the hundreds of millions.