The 'game changer' antibody test: When will it be ready and how accurate will it be?

Antibody tests have been described by scientists and even the prime minister as a 'game changer'. But what are they, why are they so important - and if they are crucial - why haven’t we got one yet?

ITV News Science Editor Tom Clarke and ITV News Health Correspondent Emily Morgan speak to Dr Emily Adams, senior lecturer at the Liverpool School of Tropical Medicine, who is helping to validate some of the antibody tests.