With the PCR test, a sample is taken from the nasopharynx using a nasopharyngeal swab. With the rapid antigen test, a comfortable swab is taken from the front nasal area (1.5 cm). In a PCR test, DNA is multiplied in a laboratory in a chain reaction (polymer chain reaction) and thus raised above the detection limit. An antigen test does not detect the DNA, but protein fragments of the coronavirus. No multiplication of the virus material is carried out for this. Both methods detect whether an infection with SARS-CoV-2 is present.