As the result of a smallpox scare at Lehigh University in February, 1924, a rule was adopted requiring every student who matriculated at the university to be vaccinated by the Students' Health Service unless he had been successfully vaccinated within the past three years. The term "successful" has been interpreted in this rule as meaning a true vaccinia, and a certificate of vaccination is not accepted unless supported by a definite scar of an obviously recent vaccinia. It was foreseen that it would be necessary to vaccinate a very large number of students (the entire enrolment of 1,400) the first year the rule was in effect and practically the entire freshman class of about 600 each succeeding year. It was also foreseen that this work would have to be carefully planned in order to develop a method of vaccination that would not interfere too much with class hours and thus
THOMAS S, BULL RC. THE PRESSURE VACCINATION TECHNIC. JAMA. 1927;88(24):1879–1881. doi:10.1001/jama.1927.02680500021009
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