title: [Similarities and dissimilarities in the clinical picture of influenza occurring in the years 1969, 1970, 1971 and 1973 as well as some epidemiologic aspects of influenza].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D007251:Influenza, Human / Q000150:complications / Q000453:epidemiology* / Q000401:mortality; D008297:Male; D008875:Middle Aged; D011044:Poland
vernacular_title: Podobieństwa i róznice w obrazie klinicznym grypy w 1969, 1970, 1971 i 1973 roku i niektóre aspekty epidemiologiczne grypy