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The new booster targets the XBB.1.5 omicron subvariant, which is similar to the dominant variant now circulating.
A second booster dose resulted in 123,869 fewer hospitalizations and 5,524 fewer deaths versus a single-dose campaign.
A second booster is appropriate as long as at least four months have passed since a person’s last COVID-19 shot.
The new vaccines will target the XBB.1.5 coronavirus subvariant and offer some protection for closely related strains.
Moderna faces pressure since the US government subsidized its vaccine development.
The Biden administration is working on contracts for the reformulated booster doses.
Approximately 91% of Americans ages 12 years and older can now get the vaccines within five miles of home, as 14 million doses have been shipped.
The advantages of an inhaled vaccine include the concept of priming the area of the body where the virus often enters.