Antibody tests fail to detect people who had mild coronavirus symptoms

Tests designed to check whether people have had coronavirus might be missing those who only experienced mild symptoms, a new study has found. Researchers at Oxford University gave an antibody test to more than 900 healthcare workers and found significant numbers came back negative, even among those who were likely to have contracted Covid-19. The findings have thrown fresh doubts over the accuracy of the tests and how they can be used to help the UK avoid another lockdown.