[Analysis of respiratory virus infections in the German Democratic Republic for the second quarter of 1971].
D005859:Germany, East; D006801:Humans; D012141:Respiratory Tract Infections / Q000453:epidemiology*; D014777:Virus Diseases / Q000453:epidemiology*
Analyse respiratorischer Virusinfektionen in der DDR für das II. Quartal 1971.