One day last week Professor Roscoe Raymond Hyde of Johns Hopkins heard that Puerto Rico is suffering from an epidemic of influenza (10,000 cases; no deaths). Next day he heard that the region around Hagerstown, Md. also is suffering from an epidemic of influenza (1,000 cases; no deaths). Those epidemics Professor Hyde feared might denote the beginning of a pandemic such as devastated the U. S. in 1918. Immediately he sent for a dozen ferrets on which to test the virulency of the germs which were causing the Hagerstown trouble. When Professor Hyde expresses...
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