Booster shots of the mRNA vaccines failed to block omicron, a study found, although the breakthrough infections involved only mild or moderate symptoms.
A study of some of the first breakthrough cases of COVID-19 caused by the highly infectious omicron variant found that booster shots of the mRNA vaccines failed to block that strain, although the infections involved only mild or moderate symptoms, confirming they are effective in preventing serious illness and death.
“These findings support the need for updated vaccines to provide better protection against symptomatic infection with omicron and emphasize that non-pharmaceutical measures should be maintained,” the authors wrote. In the U.S., omicron has pushed new cases and hospitalizations to record levels, according to a New York Times tracker. Cases are averaging close to 800,000 a day, while hospitalizations are above 158,000. That number includes patients in the hospital with other symptoms who have tested positive for the virus.
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