Even in the initial data released by the FDA, Pfizer didn't test all patients for COVID during the trial. In fact, they didn't even test all 'suspected' cases during the trial. In fact, there were more 'suspected but not verified' cases among the test group than the control.

It was junk science from top to bottom, and this assumes any science was conducted at all. According to a whistle blower, the science was fraudulent.