Many Health Care Workers Who Have Coronavirus Don't Have Symptoms: Study

Four in 10 health care workers who test positive for COVID-19 don't have symptoms, which means they could unknowingly spread the disease to co-workers and patients, researchers say.

For the new study, the research team reviewed 97 studies that included more than 230,000 health care workers in 24 countries. Rates of SARS-CoV-2 infection...

4 Out of 5 People With COVID-19 Will Develop Symptoms: Study

Folks shrugging off the risk of COVID-19 because they don't think the virus will do them much harm might want to think again.

As many as four out of five people infected with the new coronavirus likely will suffer some symptoms of COVID-19, a new analysis shows.

Only about 20% of infected people remain symptom-free while ...

Teens Aren't Turning to E-Cigarettes to Quit Smoking

Most teens who vape aren't looking to quit smoking, a new study of Twitter suggests.

This finding belies Juul's claim that its e-cigarette is improving smokers' lives, the researchers said.

For the study, researchers analyzed more than 4,000 tweets and found that only 1% of Twitter users mentioned Juul as a way to stop ...

Certain Cancer Treatments May Heighten Danger From COVID-19

People with cancer are at increased risk for severe COVID-19. Now, a preliminary study suggests that certain cancer therapies may heighten those odds even further.

Researchers found that of 3,600 U.S. cancer patients who contracted COVID-19, the highest risk of death was among those who'd received cancer treatment within the past three...

Sleep Builds the Brain in the Early Years, Then Maintains It

For the very young, sleep builds and strengthens the brain, but it quickly switches to maintenance and repair before a child turns 3, new research shows.

Before about the age of 2½, the brain grows rapidly. And during REM (rapid eye movement) sleep a baby's brain builds and strengthens synapses, which connect neurons to each other...

Baby's Heart Rate Reflects Mom's Mental Health

Babies of mothers with anxiety or depression can have significantly higher heart rates than normal, a new study finds.

And this might put them at risk for long-term problems, researchers say.

Mother-infant interaction plays a crucial role in children's healthy development, but moms with depression, anxiety or postnatal depres...