If the vaccine caused people to test positive for C19, it would be easier to blame the virus for the vaccine injury or death. Oh, wait...here is one that might. Before releasing the InteliSwab COVID-19 Rapid Test to the market, the manufacturer checked for interactions with multiple viruses, bacteria and fungi, as well as things that might be in the nose (nose sprays, mouthwash, ointments, hand lotion...). However, under Limitations of the Test, they note that " Potential cross reactivity of the InteliSwab™ COVID-19 Rapid Test with COVID-19 vaccines or therapeutics has not been evaluated." So, wait. You check to see if all these other things interfere with test results. Then you consider that the vaccine could interfere with results, but you don't check? Or, did you check and then decide you weren't happy with the results?