No, taking antibiotics will not affect covid test results. Tests for COVID-19 work by looking for the presence of certain parts of the virus itself. These are unique to COVID-19 and therefore confirm it is there in the sample.
Antibiotics only work against bacteria (germs) and not viruses like COVID-19. Therefore, taking antibiotics will not affect the levels of virus in the body or interfere with a test. This page explain a little more about how antibiotic treatments work, check it out.
You can read more about the tests and how they work on the Royal College of Pathologists website here.
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COVID-19