Herd Immunity Theory Has Been Repeatedly DisprovenNearly every year, there are outbreaks of infectious diseases in the U.S. in which the communities involved were highly vaccinated and, thus, supposedly immune. In each of those situations there was an illusion of protection. It wasn’t real. There was no herd immunity. This has certainly been true for pertussis. In science, when a theory is disproven, the scientific thing to do is to put it aside and develop a new theory for explaining something. That is not what doctors, public health officials, legislators, and the media are doing. Instead, they are clinging to a disproven theory and using it to justify mandating vaccination for everyone and shaming those who choose to exercise their informed consent rights and reconsider this medical intervention.