Dr. Hotez confessed to the committee that his colleagues had killed a number of children from pathogenic priming during experiments with the respiratory syncytial virus (RSV) vaccines in 1966, and recounted that during his own earlier work on coronavirus vaccines, he saw the same effect on ferrets: We started developing coronavirus vaccines and our colleagues—we noticed in laboratory animals that they started to show some of the same immune pathology. So we said, “Oh my God, this is going to be problematic.”
