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Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

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A person gets a COVID-19 test outside The Late Show with Stephen Colbert at the Ed Sullivan Theater in New York City. Photo: Noam Galai/Getty Images

The Centers for Disease Control and Prevention has revised its COVID-19 testing guidance for fully vaccinated people, recommending tests after exposure even if they don't show any symptoms.

Flashback: The agency previously said that fully vaccinated people did not need tests after coming into contact with an infected person unless they experienced symptoms.

Driving the news: The new testing guidelines came the same day that the CDC said those who are fully vaccinated should wear masks indoors in certain areas of the U.S. that have substantial or high virus transmission.

  • The agency also clarified that masks should be used regardless of the level of the level of transmission "if you have a weakened immune system or if, because of your age or an underlying medical condition, you are at increased risk for severe disease, or if a member of your household has a weakened immune system."
  • CDC Director Rochelle Walensky clarified that the change was prompted by new data that suggests "that even vaccinated people who are infected by Delta may carry large amounts of the virus and transmit it to others," the New York Times writes.

What they're saying: "If you’ve been around someone who has COVID-19, you should get tested 3-5 days after your exposure, even if you don’t have symptoms," per the CDC's updated recommendation.

  • "You should also wear a mask indoors in public for 14 days following exposure or until your test result is negative. You should isolate for 10 days if your test result is positive."

Go deeper

22 hours ago - Health

1 in 500 Americans has died of COVID-19

Expand chart
Data: CDC and U.S. Census Bureau; Table: Danielle Alberti/Axios

The U.S. has reached a grim pandemic milestone: More than 1 in 500 Americans has died of COVID-19, according to the latest available data.

Why it matters: The rising death toll highlights the continued effects of the Delta variant and the ongoing struggle to get Americans vaccinated.

By the numbers: The total number of COVID-19 deaths recorded in the United States is 665,496 as of 5 p.m. ET on Wednesday, according to reporting by Johns Hopkins University.

  • 30.1% of COVID-19 deaths in the U.S. involved individuals ages 85 and older as of Wednesday, despite only making up 2% of cases and an equal portion of the population.
20 hours ago - Science

Moderna suggests booster shots, citing clinical data

A box of the Moderna COVID-19 vaccine in Indonesia. Photo: Algi Febri Sugita/SOPA Images/LightRocket via Getty Images

Moderna vaccine's efficacy declines a year after it's administered, compared to protection seen in recently inoculated individuals, the vaccine maker announced Wednesday.

Driving the news: Moderna made its case for supporting booster shots, citing clinical trial data that demonstrate breakthrough infections are less common among participants approximately eight months after receiving the first dose compared to approximately 13 months.

Sep 15, 2021 - Health

Pfizer says data suggests COVID vaccine boosters are warranted

A nurse administering a booster shot of Pfizer's COVID-19 vaccine on Aug. 19 in Pasadena, Calif. Photo: Robyn Beck/AFP via Getty Images

Pfizer told the FDA Wednesday that data from its clinical trials suggests a third shot of its coronavirus vaccine may be necessary six months after the second dose because of waning efficacy.

Why it matters: The FDA's advisory committee on Friday is expected to review Pfizer's clinical trials and other supporting and conflicting data on coronavirus booster shots and make recommendations on whether more Americans 16 years and older should receive an extra dose.

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