Scientists ponder when, why of emerging viruses.
Marwick
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D000818:Animals; D003715:Dengue / Q000453:epidemiology / Q000382:microbiology; D004196:Disease Outbreaks; D004199:Disease Vectors; D006480:Hemorrhagic Fever with Renal Syndrome / Q000635:transmission; D006801:Humans; D009154:Mutation; D011159:Population Surveillance; D014481:United States; D014777:Virus Diseases / Q000453:epidemiology*