MOSCOW — Russia’s sovereign wealth fund, the Russian Direct Investment Fund (RDIF), proposed that US drugmaker Pfizer start joint trials with Sputnik Light as a booster Covid-19 vaccine shot. “Delta cases surge in the US and Israel shows mRNA vaccines need a heterogeneous booster to strengthen and prolong immune response,” Russian Direct Investment Fund said in a tweet on Aug. 11. “Sputnik V pioneered mix […]
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