It can also be possible that the positive results you got were false. When your antibody test results turn out to be positive, it means that you contracted COVID-19 in the past, and your system was able to defeat it because you developed antibodies or immunity against the virus. This kind of antibody test result is known as a false-positive. Some of the factors that can lead to a false-positive include:
This type of test detects antibodies developed when a person is affected with other types of coronaviruses, such as the common cold.
Suppose the test is done in an area that has very few cases of COVID-19 infections. Typically, populations with higher rates of COVID-19 infections often work well with these tests.