Delta variant of Covid-19, first identified in India, than any other vaccines so far, the Russian Direct Investment Fund (RDIF) said on Tuesday.Taking to Twitter, the official handle of the Russian vaccine affirmed that Sputnik V's efficacy is better on the Delta variant than any other vaccine that published results on the strain so far."RDIF: "SputnikV is more efficient against the Delta variant of coronavirus, first detected in India than any other vaccine that published results on this strain so far - the Gamaleya Center study submitted for publication in an international peer-reviewed journal," tweeted Sputnik V.BREAKING | RDIF: “#SputnikV is more efficient against the Delta variant of coronavirus, first detected in India than any other.