Neil Z. Miller

“Herd immunity may never be achieved because high vaccination rates encourage the evolution of more severe disease-causing organisms “A partially effective immune response — enough to exert selective pressure but not effective enough to suppress escape viral mutants — is the most effective driving force of antigenic variation.” Rodpothong P, Auewarakul P. Viral evolution and transmission effectiveness. World J Virol 2012 Oct 12; 1(5): 131-34. In theory, if enough people are vaccinated, herd immunity will be achieved and chains of infection will be disrupted. In reality, a true herd immunity threshold may never be reached within normal heterogenous populations. If a true herd immunity threshold level is achieved, it will create a strong selective pressure that encourages the emergence of mutant viral strains.”
― Neil Z Miller, Miller's Review of Critical Vaccine Studies: 400 Important Scientific Papers Summarized for Parents and Researchers