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Both Pfizer and Moderna’s Omicron boosters are "bivalent" vaccines, meaning they protect against Omicron BA.5 and BA.4 subvariants and the original SARS-CoV-2 virus. "The goal of a COVID vaccine ...
Though COVID-19 vaccines and boosters provide strong protection against severe disease, hospitalizations, and deaths, the quickly-spreading Omicron variant remains a significant challenge.
With new COVID-19 boosters expected later this year, health experts urge Californians not to put off a first or second booster shot until then.
A January 2022 study by the UK Health Security Agency found that vaccines afforded similar levels of protection against symptomatic disease by BA.1 and BA.2, and in both it was considerably higher after two doses and a booster than two doses without booster, [263] [264] though because of the gradually waning effect of vaccines, further booster ...
A study of the bivalent booster effectiveness against severe COVID-19 outcomes in Finland, September 2022–January 2023, has shown that it reduced the risk of severe COVID-19 outcomes among the elderly. By contrast, among the chronically ill 18–64-year-olds the risk was similar among those who received bivalent vaccine and those who did not.
BA.5, a new Omicron subvariant of the coronavirus, has become dominant in the U.S., accounting for 65% of infections nationwide, according to the Centers for Disease Control and Prevention.Some ...
The fast-spreading Omicron variant. It causes milder illness compared with previous versions of the coronavirus.And that has furthered the idea that COVID-19 poses less of a risk than in the past ...
Two-dose COVID-19 vaccine regimens do not induce enough neutralising antibodies against the new variant, British scientists found. Two-dose vaccines induce lower antibodies against Omicron, study ...