J&J, Sinopharm, Sputnik V COVID-19 shots less effective against Omicron, study shows
Reuters, 18 Dec 2021
COVID-19 vaccines from Johnson & Johnson and China's Sinopharm, as well as Russia's Sputnik V shot, had no neutralizing activity against the Omicron variant of the coronavirus, according to a study which has not yet been peer reviewed.
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