Covid-19 vaccine appears to work against a key mutation in the highly transmissible new strain of coronavirus detected in Britain and South Africa.The not-yet peer-reviewed laboratory study conducted by Pfizer and scientists from the University of Texas Medical Branch indicated the Covid-19 vaccine was effective in neutralising the killer virus with the so-called N501Y mutation of the spike protein.Also Read | Virus spread slows but two states still a worryThe mutation could be responsible for greater transmissibility and there had been concern it could also make the virus escape antibody neutralisation elicited by the vaccine, news agency Reuters quoted Phil Dormitzer, one of Pfizer's top viral vaccine scientists, as saying.The study was.