An analysis of hundreds of COVID-19 cases suggests that face masks are most protective in specific circumstances, such as exposure to a person with COVID-19 that lasts for more than three hours or that takes place indoors1.
The U.S. Centers for Disease Control and Prevention's recommendations for the upcoming holiday season include the idea of using a window fan to keep air at an indoor party as fresh as possible. ...
Superspreader events that first seeded the coronavirus in the United States are keeping the pandemic smoldering, with experts pointing to human behavior and social circles as the main drivers.
Doctors are beginning to notice Covid-19 cases that look more like a very bad cold, especially in areas of the country where the highly contagious delta variant is quickly spreading.
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