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Two shots of COVID-19 vaccine without an additional booster offer essentially no lasting protection against infection with Omicron, and a coronavirus infection is as effective as a recent booster ...
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 ...
In contrast, two vaccine doses, followed by an initial omicron infection, may protect more against a second omicron infection than an extra jab, according to a preprint study published Nov. 1 to ...
A Qatar study that has yet to be peer reviewed found that people who had a pre-Omicron COVID infection had about a 28% protection against BA.4 or BA.5. A prior Omicron infection, however, offered ...
Danish study shows decline in vaccine protection against omicron is restored with Pfizer booster Fact-check: Did a study show vaccinated people more likely to be infected with omicron? Skip to ...
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 ...
COVID-19 vaccines are holding up against "stealth" Omicron almost as well as they do against the original version of the variant, a new study finds. (Steven Senne / Associated Press)
South African scientists are warning that reinfections among people who’ve already battled COVID-19 appear to be more likely with the new omicron variant than with earlier coronavirus mutants.