New Covid vaccine

New Covid vaccine from Valneva produces stronger immune response when compared to AstraZeneca, the French company reports, with no severe cases of Covid-19 seen in either group. And new positive research on lateral flow tests. Plus guest Graham Easton discusses the urgent need for teaching climate and environmental health in medical schools. Presenter: Claudia Hammond Producer: Erika Wright (Picture: Coronavirus vaccine vials on a laboratory shelf. Photo credit: Joao Paulo Burini/Getty Images.)