When the experimental mRNA vaccines rolled out in the United States, the Centers for Disease Control and Prevention (CDC) had an operating manual for their immunization safety teams. These teams would monitor the nation’s vaccine adverse events database. And according to their procedures, they would look for safety signals on a weekly basis by comparing the COVID vaccines against another established vaccine like one for the flu.
This methodology, called the Proportional Reporting Ratio (PRR), is the most basic layer of security against problems with the vaccine. It’s like a smoke detector. It’s not perfect, but it doesn’t have to be, because its main purpose is to raise an alert for further investigation….