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A. C. McKean, M.D.
JAMA. 1934;103(4):277. doi:10.1001/jama.1934.02750300051027.
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To the Editor:—  I am interested in the communications on simultaneous immunizations in The Journal, April 14, April 21 and June 2.I was in charge of a mobile clinic in Utah from June 1928 to April 1930 for the prevention of disease. During one year I gave more than 63,000 doses of vaccine. Experience proved that a person could be immunized against diphtheria, typhoid and smallpox at the same time without more reaction than one gets from vaccine given for only one disease, as nearly as I could judge.From April 1930 to September 1930 I served as director of the Utah County Health Unit at Provo, Utah. From September 1930 to July 1933 I served as director of Gila County Health Unit at Globe, Arizona. As deaths were occurring in Gila County from both typhoid and diphtheria and as smallpox was present, I gave simultaneous inoculations for all


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