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A test for antibodies is one of the most common ways to check if you've been infected with Covid-19 virus. Antibodies are produced by our immune systems to help us fight off infections by the virus. New research finds that the presence of antibodies against the coronavirus in the blood declines over time and that the speed of their disappearance is related to how seriously ill people become with infection. The more severe your experience of Covid-19, the more antibodies you have and this level can be maintained for longer than people who have not had such serious symptoms. Dr Katie Doores, a biochemist from Kings College London, explains the research and also the possibility that even if your antibodies have disappeared after a first infection, your body may be primed to produce antibodies more rapidly should you be re-infected.

Photo: A finger prick blood sample as part of of an antibody test for COVID-19 Credit: Getty Images