What is the coronavirus antibody test and why is it a 'game-changer'?

It involves taking a small sample of blood and testing it for antibodies which will indicate exposure to coronavirus. Public Health England (PHE) has evaluated the new Roche test and has approved it as being safe and reliable for widespread use. A test that is 100 per cent specific means all healthy individuals are correctly identified as healthy - there are no false positives. Some experts say the Roche test does leave room for false positive results. The Government plans to first roll out the test to front-line workers such as those in health and social care. If it proved immunity, people could go back to work and socialise with others without fear of catching or spreading the virus.