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In the early 1950s, the United States administered four vaccines -- diphtheria, tetanus, pertussis and smallpox. Children received 13 doses of four vaccines by the time they were two years old and not more than three vaccines in a single visit.

By the mid-1980s, there were seven vaccines -- diphtheria, tetanus, pertussis, measles, mumps, rubella and polio.


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