title: Influenza 1970: unquestioned answers and unanswered questions.
mesh_terms: D000818:Animals; D002980:Climate; D004196:Disease Outbreaks; D004197:Disease Reservoirs; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D009975:Orthomyxoviridae / Q000302:isolation & purification; D012621:Seasons; D014887:Weather