I didn’t say the worst thing. I said the strangest.
Here it is: Proponents claim a vaccine stimulates a person’s immune system to produce antibodies, which are immune-system scouts.
This is supposedly a rehearsal. The immune system gets a chance to respond to a “test run,” so that when the real disease hits, the immune-defense will be ready and will knock out the disease quickly.
Except there are many diagnostic tests for disease that look for antibodies, and if antibodies show up, the doctor tells the patient he has the disease.