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B-cells (orange) secrete antibodies (white) against viruses (blue)

Juan Gaertner/Science Photo Library

IN JANUARY, I gratefully received my first dose of the Oxford/AstraZeneca coronavirus vaccine. But not everyone experiences an immune response to a shot. If mine has kicked in, I should have enough antibodies to protect me from covid-19. So it was worrying when I received results from an immunity test that suggested I had a low level of antibodies. Am I immune or not?

There are three quantitative antibody tests, or “immunity trackers”, coming onto the market that are designed to tell me. The tests identify neutralising antibodies …