CDC studies find COVID booster shots very effective against hospitalization, death
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A pair of studies from the CDC found that those who received a COVID-19 booster shot were much less likely to be hospitalized or die compared to those who were unvaccinated or only received a primary vaccine series.
In the first study, published in the MMWR, receiving two or three doses of an mRNA COVID-19 vaccine -- such as those made by Moderna (NASDAQ:MRNA
-2.5%) and Pfizer (NYSE:PFE
+0.0%)/BioNTech (BNTX
-1.2%) was associated with a 90% risk reduction for COVID-19âassociated mechanical ventilation or death.
Those who received three doses when the Omicron variant was prevalent saw risk reduction of 94%.
The second study, also published in MMWR, found that in January, unvaccinated adults and those with only a primary series of vaccination, were 12 and three times as likely to be hospitalized, respectively, as those who received booster or additional doses. 
Other vaccine names: AstraZeneca (AZN
+0.9%), Johnson & Johnson (NYSE:JNJ
+0.8%), and Novavax (NVAX
-5.0%).
A U.S. FDA advisory panel in early April will meet to discuss potential additional booster shots.