Cloth Masks Do Not Protect Against Virus as Effectively as Others, C.D.C. Says
The Centers for Disease Control and Prevention on Friday clarified its stance…
Emerging Data Raise Questions About Antigen Tests and Nasal Swabs
A small, new real-world study suggests that two widely used at-home antigen…
More People Are Getting Unapproved Fourth Doses of the Covid-19 Vaccine
If asked to show her vaccine card, Stacey Ricks can choose from…
Covid-19 At-Home Testing and PCR, Rapid Testing Questions: What to Know
“If you can’t get tests, you have to decide how much risk…
Most Covid Infections May Soon Be Breakthroughs. Here’s What That Means.
Hospitals are already overburdened by Delta patients, and the consequences of many…
What We Know About the New Covid Variant, Omicron
Citing the potential for waning immunity six months or more after vaccination,…
Omicron Is Here. Should You Cancel Your Trip?
David Freedman, the president-elect of the American Society of Tropical Medicine and…
As Thanksgiving Approaches, U.S. Virus Cases Tick Upward Once More
Dr. Rebecca Smith, an epidemiologist at the University of Illinois, said she…
Should Our Supervisor Have Told us That a Work Colleague Had Covid?
There are two things you might call principles here. The first is…
