Well, this is related to my post kind of. Anyone getting the vaccine is unknowingly entering into a secret trial. Some just get saline, some get the "vaccine." Hospitals are forced to track every lot number very strictly because that would be the only way to know who has the real vaccine and who got a placebo. But this is double-blind. The nurses do not know which is which and the patient doesn't know either. The only way to tell is to get tested for antibodies.