蜜芽传媒

UK and Russian scientists are teaming up to trial a combination of the Oxford-AstraZeneca and Sputnik V vaccines to see if protection against Covid-19 can be improved. Mixing two similar vaccines could lead to a better immune response in people. And the WHO has announced its secured nearly a billion doses of the leading jabs for low and middle income countries. We hear from professor Michael Kinch - a vaccine specialist and associate vice chancellor at Washington University in St Louis in the US.