This depends on the type of test being used. None of the authorized and recommended COVID-19 vaccines cause you to test positive on viral tests, which are used to see if you have a current infection. Since no COVID-19 vaccine contains live virus, they will not produce a positive result on a viral test. When your body develops an immune response to vaccination, you may test positive on some antibody tests. Antibody tests look for indications of an immune response. Testing positive on an antibody test does not mean a person has COVID-19. A polymerase chain reaction (PCR) test looks for parts of the virus. Since no COVID-19 vaccine contains live virus, they will not produce a positive result on a PCR test.