Does anybody know if there has ever been testing done on the swabs in the PCR tests? Is it possible that the disease is actually spread through testing and less through actual transmission.

It took me two years to take a test, was negative… A week later, I was positive for Covid.

Same thing happened with my parents. My dad finally took a test because he had to get surgery, negative… A week or two later, he was positive for Covid.

Any possibility the swabs are all or mostly contaminated to actually cause the disease or diseases?