Topic: Amesh Adalja

The results of an early phase 1 trial in 40 adults over the age of 55 suggests that one vaccine, under development by drugmaker Moderna, elicits an immune system response that's equal to that seen in younger recipients.

You're feeling pretty sick -- headache, fever, fatigue, a cough -- but your COVID-19 test came back negative. Well, chances are good that you don't have COVID-19 if that's what the test says, according to experts.

Key differences in immune system function may help determine why severe, life-threatening COVID-19 tends to target older men, scientists say.

Americans are generally well-versed about the use of masks to prevent the spread of COVID-19, although knowledge gaps about face coverings persist, a new HealthDay/Harris Poll reveals.

Researchers say they've uncovered significant differences in how male and female immune systems respond to the new coronavirus.

The COVID-19 coronavirus uses an unusually complex method to replicate itself inside human cells, and experts say the somewhat clunky process could be exploited to stop the virus in its tracks.

When elementary school students get their annual flu shot, everyone benefits, a new study shows.

Vaccines remain a "remarkably safe" way to protect human health, thanks to a rigorous system of safety monitoring that continues after approval, a new review shows.

COVID-19 infections were anywhere from six to 24 times higher than the number of reported cases in 10 different sites across the United States tested at different times during the pandemic, according to a CDC report.

An over-the-counter heartburn remedy is showing some potential as a symptom reliever for COVID-19, a small study finds.