Documents from U.S. Sen. Ron Johnson (R-WI), chairman of the Permanent Subcommittee on Investigations, have exposed evidence that appears to reveal the Biden administration chose to ignore a significant safety signal for ischemic stroke following administration of the Pfizer-BioNTech COVID-19 booster while it continued to advertise the shot to Americans as safe. “In addition to documents showing the detection of ischemic stroke following receipt of the Pfizer bivalent booster, the records released also contain internal communications between Biden health officials acknowledging significant statistical limitations in their ability to detect safety signals through their data analyses – called empirical Bayesian data mining.”