Epidemics usually tend to affect the people who have not been vaccinated against a disease . A group of people belonging to parish in Indiana (who did not volunteer for vaccination against MMR ) being affected with the disease is a good instance of an epidemic affecting the unvaccinated population . Vaccination may not offer 100 protection for a disease . On an average 90 of the population (as per studies conducted in the UK ) may develop protective antibodies . Some people even belief that...











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