This means your blood test did not show a clearly detectable level of certain antibodies against COVID-19 infection. This could be because:
– You have not been exposed to COVID-19.
– Antibody status (both the level of the antibodies and the type of antibodies) changes over time from the point of infection, and so antibody levels may have declined.
– You have been exposed to COVID-19 or had a COVID-19 vaccine but have different antibodies that this research test is not designed to pick up.
Please be aware this antibody test is being carried out for research purposes only and only picks up certain antibodies against COVID-19. You should continue to follow government guidance on social distancing and self-isolation as appropriate. In addition, we encourage all study members to have the COVID-19 vaccine when offered, regardless of your antibody test result.