In this Dec. 10, 2020, file photo, a Russian medical worker prepares a shot of Russia's Sputnik V coronavirus vaccine in Moscow. (Photo: AP)

The developers of Russia's Sputnik V coronavirus vaccine said Thursday a single-dose version of the shot had received approval for use by health officials in Moscow.

The Russian Direct Investment Fund (RDIF), which helped finance the vaccine, said in a statement that Sputnik Light "demonstrated 79.4 percent efficacy" compared to 91.6 percent for the two-shot Sputnik V.