![]() They also fade over time, so if you were infected in early 2020 they may now have disappeared.Īnti-N antibody tests can only reveal if it’s likely you’ve had COVID-19, and can’t tell you if your vaccine is working, since they only show the natural immune responses produced by your body. If you were infected, you might not have produced anti-N antibodies - not everybody does. (Anti-S antibodies are much more protective, which is why the spike is used in vaccines.)Ī negative test result means you have no detectable levels of COVID-specific anti-N antibodies in your blood. However, it doesn’t mean that you’re now immune, as it’s not clear how good anti-N antibodies are at neutralising the coronavirus. ![]() Negative: anti-N antibodies were not detectedĪ positive antibody test result means it’s likely you've had coronavirus before.Positive: anti-N antibodies were detected.There are three possible results from the test: What does the result of your COVID antibody test mean? But some so-called ‘memory’ B cells can remain in the body, ready to spring into action if you catch the same virus again. When you catch a virus like SARS-CoV-2, which causes COVID-19, the B cells that produce the specific antibodies for the virus multiply rapidly, and then travel around your body to tackle the infection.Īfter the infection is over, the remaining antibodies are gradually broken down over several months if they are no longer needed. This means that whatever harmful virus or bacteria you might have encountered during your lifetime, you probably have some B cells that can make antibodies against it. ![]() Your immune system is stocked with tens of millions of these white blood cells, each of which produces a different antibody that recognises a unique antigen. Antibodies recognise and stick to structures inside or on the surface of viruses and bacteria known as antigens, neutralising the threat and keeping you safe and well. Antibodies are biological molecules produced by special white blood cells in your body which control immunity. ![]()
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