7/29/2021
People fully vaccinated against COVID-19 should be tested for the virus if they come into contact with infected people, whether or not they have symptoms, say updated testing guidelines from the U.S. Centers for Disease Control and Prevention.
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7/23/2021
In a sign that vaccine-hesitant Americans are starting to worry about the rapid spread of the highly infectious Delta variant, vaccinations are beginning to rise in some states where COVID-19 cases are soaring, White House officials said Thursday.
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7/21/2021
It takes two doses of the Pfizer-BioNTech COVID-19 vaccine to "wake up" cells that play a very important role in the body's immune response, with the second dose increasing their numbers 100-fold, according to new research.
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