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Antibody test: From this value you have protection against corona

In Austria it was 432,425 people, in Germany already 2,342,843 people - As of mid-February 2021, so many of us had already met the Coronavirus SARS-CoV-2 infected. If you want to know whether you have protection against a renewed corona infection after surviving the infection, you can use one Antibody test - but what is that exactly? Here you can read everything you need to know!

To put it simply: an antibody test can do that Proof of an infection that has already been overcome bring. This is made possible by measuring the antibodies that our body's own immune system develops either after an infection or through a corona vaccination. So if you have an antibody test carried out, you will receive the answer as to whether the organism has already been in contact with the virus.

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What types of antibody tests are there?

For one, there is Tests that are evaluated in the laboratory. Two examples are the "enzyme-linked immunosorbent assay", for short ELISA and the "Chemiluminescence Immunoassays" (CLIA). Both of these tests are considered to be very precise, they can be used to detect even low antibody levels.

On the other hand there is also Rapid antibody tests, which are quasi the counterpart to the rapid antigen tests with which infections with SARS-CoV-2 can be detected. The disadvantage this rapid antibody test lies in the accuracy. They are relatively susceptible to errors. So if you want to be sure whether your body has already formed corona antibodies, you should definitely use a laboratory test.

From which antibody value do you have protection against corona?

Like all proteins, antibodies also consist of long chains of amino acids. These prevent SARS-CoV-2 from entering the cells with the help of the spike protein. The body makes this Immunoglobulins, as antibodies are also called, in response to a corona infection. It is between Acute markers, which are detectable for the first time seven to ten days after the onset of the infection and quickly decrease again, and Immunity markers, which are only measurable two to six weeks after infection and remain detectable for a longer period of time.

If you carry out a corona antibody test that is evaluated in the laboratory, the result is usually given in units of units per milliliter. A value of 0.8 units per milliliter is sufficient for a positive test result. From about 15 units per milliliter there is a high probability that one is considered protected. Corona vaccinations produce such a strong response from the immune system that, according to doctors, values ​​of more than 1,000 units per milliliter are not uncommon.

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Antibodies after surviving infection - how long does protection last?

This is very different from case to case. However, the latest study results suggest that protection is needed after a corona infection between six and nine months persists.


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