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CORRIGENDUM Vol. 46, No. 1 STUDIES OF COMBINED QUADRUPLE VACCINES AGAINST DIPHTHERIA, PERTUSSIS, TETANUS, AND TYPHOID FEVER: REACTOGENICITY AND ANTIGENICITY Page 49: The text in the right-hand column, paragraph 5, lines 7-11 should read as follows: ". . . The results of these showed the contents of the diphtheria and tetanus components to be 7 IU of antitoxin and 17 IU of antitoxin, respectively, and the content of the pertussis component to be more than 4 IU per 0.5 ml (single human dose) and almost twice as high as the WHO requirement (WHO Expert Committee on Biological Standardization, 1964 a), while the typhoid component. . ."