Moscow : Health officials in Russia has authorised the one-shot Sputnik Light version of its coronavirus vaccine for use, the Russian Direct Investment Fund (RDIF) announced today, a move that could help vaccine supplies go further in countries with high infection rates. The developers of the shot said, in a statement, that Sputnik Light “demonstrated 79.4% efficacy” compared to 91.6% for the two-shot Sputnik V.The single-dose Sputnik Light vaccine demonstrated 79.4% efficacy according to analysed data taken from 28 days after the injection was administered as part of Russia’s mass vaccination programme between 5 December 2020 and 15 April 2021,” the RDIF said in a statement.