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The Russian Direct Investment Fund (RDIF) has proposed that US drugmaker Pfizer start joint trials with Sputnik Light as a booster COVID-19 vaccine shot, the RDIF said on Wednesday."Delta cases surge in US & Israel shows mRNA vaccines need a heterogeneous booster to strengthen & prolong immune response. #SputnikV pioneered mix & match approach, combo trials & showed 83.1% efficacy vs Delta. Today RDIF offers Pfizer to start trial with Sputnik Light as booster," it said in a Tweet.It further said that Sputnik V is the first in the world to offer combo trial to AstraZeneca in November 2020, co-sponsored mix & match trials with AstraZeneca, Moderna and Sinopharm."Sputnik V was the 1st in the world to offer combo trial to AstraZeneca in Nov 2020, co-sponsored mix & match trials with AstraZeneca, Moderna & Sinopharm. Since then heterogeneous boosting pioneered by Sputnik proved to be effective vs mutations," it added further.According to an official ...