Four glass vials sit on a reflective tabletop next to a syringe. Each is labeled as a subsequent dose in a four-dose series of COVID-19 vaccines.
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines
Studies show that a fourth mRNA vaccine dose offers the elderly and other high-risk groups strong protection against hospitalization and death from COVID-19, but experts say benefits for other populations may be more limited.
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines

Studies show that a fourth mRNA vaccine dose offers the elderly and other high-risk groups strong protection against hospitalization and death from COVID-19, but experts say benefits for other populations may be more limited.

Studies show that a fourth mRNA vaccine dose offers the elderly and other high-risk groups strong protection against hospitalization and death from COVID-19, but experts say benefits for other populations may be more limited.

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omicron
Woman in face shield and blue gown taking cotton swab of patient's mouth while patient sits inside of car
What You Should Know About New Omicron Subvariants
Natalia Mesa | May 17, 2022
The presence and spread of new, more-infectious and immune-evading variants show that the coronavirus is not done mutating.
Vector abstract world around coronavirus macro illustration.
Living the Life Pandemic
Bob Grant | Mar 16, 2022
The first part of 2022 is giving us a glimpse of humanity’s future relationship with COVID-19.
Illustration of SARS-CoV-2 virus in red and blue
Scientists Investigate Omicron Subvariant BA.2
Catherine Offord | Jan 28, 2022
This strain of SARS-CoV-2 is causing new outbreaks in Europe and Asia and may spread slightly faster than the better-known BA.1 Omicron subvariant, although it’s too early to say for sure.
Rapid antigen tests for SARS-CoV-2
Are Rapid Tests Worse at Detecting Omicron—and Does It Matter?
Catherine Offord | Jan 14, 2022
Anecdotal reports and results from small studies on the diagnostics’ accuracy have prompted questions about the devices’ usage with the new variant, but researchers say more data are needed and emphasize the continued importance of SARS-CoV-2 testing.
A person lying on a bed checks the reading on a digital thermometer. A table with a bowl of oranges and various medications is in the background.
How Mild Is Omicron Really?
Dan Robitzski | Jan 14, 2022
Early reports that Omicron causes less-severe disease than Delta seem to be borne out, but it’s not yet clear to what extent that’s due to the variant itself versus the populations it’s infecting.
Several silver foil pill packs with white pills
FDA Authorizes Pfizer’s Paxlovid, First Oral Therapy for COVID-19
Jef Akst | Dec 23, 2021
Given within three days of symptom onset, the pill combination was nearly 90 percent effective at preventing high-risk patients from developing severe illness in a clinical study.
a blood bag partially full of yellow liquid
Convalescent Plasma for COVID-19 Cuts Hospitalizations: Preprint
Shawna Williams | Dec 21, 2021
Unlike studies of antibody-rich transfusions in hospitalized patients, which overall have not found clear benefits, a new randomized trial finds that early convalescent plasma treatment cuts hospitalizations in half.
An artist’s rendering of the Omicron variant portrays the virus as a lumpy blue sphere with several orange spike proteins jutting out of it.
Omicron Propagates 70 Times Faster than Delta in Bronchi: Study
Dan Robitzski | Dec 17, 2021
A preprint reports that the new SARS-CoV-2 variant multiplies faster in human bronchial tissue but slower in lung tissue than the Delta variant, potentially explaining how it’s spreading from person to person so quickly.