Antibody tests may be missing large numbers of people who contracted Covid-19 because they don’t work for people who had a mild infection, new research from Oxford University suggests. A study of more than 9,000 healthcare workers suggested significant numbers of people were getting ‘negative’ test results, despite probably having had the virus. https://www.telegraph.co.uk/global-health/science-and-disease/antibody-tests-may-miss-people-had-mild-symptoms-coronavirus/