Russia's Sputnik V Covid-19 vaccine is highly effective in fighting off and neutralising the aggressive coronavirus variant first discovered in Brazil, according to Russia's Direct Investment Fund (RDIF) and a study conducted by researchers in Argentina.

Brazil's P1 coronavirus variant, behind a deadly Covid-19 surge in Brazil, has spread throughout hard-hit Latin America. Scientists in Brazil have found that the variant's mutations could make it more resistant to antibodies, raising international concern over its potential to render vaccines less effective...