[A study on the causes of an epidemic of influenza, especially an analysis of relative humidity as a main cause].
D004196:Disease Outbreaks / Q000453:epidemiology*; D006801:Humans; D006813:Humidity; D009980:Influenza A virus; D007251:Influenza, Human / Q000453:epidemiology*; D007564:Japan; D008685:Meteorological Concepts