In this Tuesday, May 26, 2020, photo released by Nucleus Network/ABC, clinical trial participants are monitored during Novavax COVID-19 vaccine testing in Melbourne, Australia. On Thursday, Jan. 28, 2021, Novavax said its vaccine appears 89% effective based on early findings from a British study and that it also seems to work — though not quite as well — against new mutated strains of the coronavirus circulating in that country and South Africa. (Patrick Rocca/Nucleus Network/ABC via AP)
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