Medicine: Yellow Fever

"Yellow fever," says Dr. Fred L. Soper, director of the Pan American Sanitary Bureau, "is not a dead duck. It has not been conquered, and it has not been eliminated as a permanent threat to the U.S." U.S. public-health officers, who thought they had closed the book on yellow fever long ago, are being warned not to take recent U.S. immunity for granted. Town-dwelling mosquitoes, Aëdes aegypti, which carry the virus, are found in a continuous belt reaching from El Salvador through Mexico and into much of the U.S. Most of the U.S. South (all the territory below a line...

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