COMPULSORY immunization, specifically smallpox vaccination, was required in some States not long after this country became a nation.Almost all the States now have some type of regulation regarding smallpox vaccina- tion for the general population.Some statutes make specific reference to smallpox vaccination for children before they can enter school but, for the most part, such legislation encompasses Pertussis Tetanus disease or new law diseases
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Charles L. Jackson (1969) studied this question.