Abstract
IMMUNIZATION against diphtheria and tetanus in childhood is now a well established procedure in Massachusetts as well as many other communities. The large majority of infants receive a solid basic immunity against these diseases through the standard application of triple vaccine (pertussis, diphtheria and tetanus). The Institute of Laboratories of the Massachusetts Department of Public Health has issued for the last three years twice as many doses of this preparation as the number of annual births in Massachusetts. The recommended procedure of booster immunization with the triple antigen at the time of entry into elementary school is widely followed.Recent . . .

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