Second Typhus Serum

Harvard last week took its place beside the U. S. Public Health Service as a victor in man's fight against typhus fever. Surgeon Rolla Eugene Dyer, U.S. P. H. S., after letting rat fleas feed on his leg, last year produced a vaccine efficacious against the mild, flea-borne typhus which occurs along the Atlantic and Gulf Coasts (TIME, Nov. 7, et ante). Harvard's Professor Hans Zinsser has been developing a vaccine and serum against the louse-carried, virulent type of typhus which constantly threatens to invade the U. S. from Eastern Europe and Mexico. Last week Harvard reported that the Zinsser serum works, that Mexican health authorities are inoculating the populace with Zinsser serum in hope of national prophylaxis.

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