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FILE PHOTO: A scientist works inside a laboratory of the Gamaleya Research Institute of Epidemiology and Microbiology during the production and laboratory testing of a vaccine against the coronavirus disease (COVID-19), in Moscow, Russia August 6, 2020. The Russian Direct Investment Fund (RDIF)/Handout via REUTERS
High-profile Covid-19 vaccines developed in Russia and China share a potential shortcoming: They are based on a common cold virus that many people have been exposed to, potentially limiting their effectiveness, some experts say.
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