Researchers studied blood samples from December 2019, and found a small number tested positive for antibodies against the virus.

This complex problem that has plagued researchers for decades.

Doctors observed a "tubular ... structure that moved with a curling motion" inside his stomach.

The safest way to celebrate Thanksgiving is at home with people in your household, the agency said.

The test, made by Lucira Health in California, requires a prescription.

Japan was scheduled to host the Olympic Games in the summer of 2020, but the coronavirus pandemic forced officials to postpone the competition until 2021.

Cloth face masks offer two-way protection, benefitting both the wearer and those around them.

Restaurants were the riskiest venues for transmission, followed by gyms, coffee shops and hotels.

The country's total now stands at just over 10 million, according to Johns Hopkins University.

The researchers say this is the longest anyone has been reported to be contagious with COVID-19 while remaining asymptomatic.

These antibodies attack cells in such a way as to promote blood clots.

More than half of people living the same household as a COVID-19 case also became infected.

The condition, known as cold urticaria, is fairly rare and can cause anaphylaxis.

A famous equation used in the search for alien life has inspired a new model that estimates the risk of COVID-19 transmission.

The agency now defines close contact as "someone who was within 6 feet of an infected person for a cumulative total of 15 minutes or more over a 24-hour period."

Mounting evidence shows that COVID-19 is more severe than flu.

Fourteen out of 22 players developed COVID-19 after the game.

The letter appears to be a response to the controversial proposal known as the Great Barrington declaration.

A man in the U.K. developed sudden and permanent hearing loss in one ear after battling a severe case of COVID-19, according to a new report.

In a global pandemic, hand-washing is even more important than it usually is.

The new coronavirus can linger on human skin much longer than flu viruses can, according to a new study from researchers in Japan.

The revised guidance follows the CDC's blunder last month, in which the agency posted, and then deleted, information on airborne spread from its website.

Like the syndrome in children, MIS-A is a severe illness that targets multiple organs and causes increased inflammation.