COVID-19 vaccines and boosters continued to have very high efficacy against severe outcomes during the Omicron wave of the virus, a large real-world study from the US Centers for Disease Control and Prevention (CDC) showed. READ:
WASHINGTON, United States — COVID-19 vaccines and boosters continued to have very high efficacy against severe outcomes during the Omicron wave of the virus, a large real-world study from the US Centers for Disease Control and Prevention showed Friday.The paper evaluated data from more than 300,000 visits to emergency departments, urgent care clinics, and hospitalizations across 10 states from August 26, 2021 to January 5, 2022.
After Omicron became dominant, the vaccine efficacy estimate against hospitalization between 14-179 days after dose two was 81 percent, 57 percent after more than 180 days from dose two, and 90 percent 14 or more days after dose three. Vaccine efficacy against infection fell to 68 percent by the time Omicron emerged. The authors weren’t able to derive an estimate for vaccine efficacy against death during Omicron, because of a lag in reporting, but the broad scientific expectation is that it will remain very high.
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