This antibody test is not a measure of vaccine effectiveness. After vaccination it can take some time for antibodies to appear in the blood which can vary from individual to individual, so depending on when you had your vaccination it may be that they have not yet appeared. It is also important to remember that these tests aren’t 100% accurate. At the moment, we do not know if the vaccine will protect everyone from getting or transmitting COVID-19. By taking part in research and telling us about your vaccination, you are helping us to understand more. Whatever your test result, you should continue to follow government guidance on social distancing and self-isolation as appropriate.