Fred L. Soper 4104 Rosemary Street Chevy Chase, Maryland 20015

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To the Editor:

I am indebted to Dr. David Sencer for a prepublication copy of his Charles Franklin Craig Lecture entitled “Health Protection in a Shrinking World.” Dr. Sencer's recommendations regarding yellow fever are of such grave import that I hasten to comment on them, hoping for simultaneous publication. As one who made his first yellow fever field trip in Brazil in 1920 while General William C. Gorgas was still director of The Rockefeller Foundation's campaign for the eradication of yellow fever, and as one who participated for many years in the study and prevention of yellow fever, I cannot remain silent in the face of these surprising proposals. Especially is it important to state that the words of the Director of the National Communicable Disease Center of the Public Health Service do not necessarily constitute a declaration of official policy of the United States Government.