PlansP. Prevalence of antibodies associated with herd immunity: a new indicator to evaluate the establishment of herd immunity and to decide immunization strategies. Med Decis Making. 2010;30:438–43.
2.
AndersonRMMayRM. Infectious Diseases of Humans: Dynamics and Control. Oxford, UK: Oxford University Press; 1991.
3.
McLeanABlowerS. Imperfect vaccines and herd immunity to HIV. Proc Roy Soc Lond B. 1993;253:9–13.