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."
The study will test how much virus is needed to infect humans and which vaccines work the best to prevent COVID-19.
Patients given the drug did not show a significant decrease in mortality, risk of ventilation or time in the hospital.
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.
Doctors say the president, who tested positive for COVID-19, could be heading for a bad stretch in prolonged illness — or an upward path to recovery.
The New England Journal of Medicine is calling for the Trump Administration to be voted out in the upcoming election.
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.
With 74-year-old President Trump and first lady Melania Trump testing positive for the coronavirus, what are the best proven treatments for them and other patients?
Americans really are drinking more during the COVID-19 pandemic. New research suggests alcohol consumption in the U.S. rose 14% during pandemic shutdowns.
Like the syndrome in children, MIS-A is a severe illness that targets multiple organs and causes increased inflammation.