title: [Epidemiologic analysis of pertussis in Poland in the years 1968-1969 against the backdrop of the world situation].
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D005060:Europe; D005061:Europe, Eastern; D006801:Humans; D007223:Infant; D011044:Poland; D012424:Rural Population; D012737:Sex Factors; D014505:Urban Population; D014917:Whooping Cough / Q000453:epidemiology*
vernacular_title: Analiza epidemiologiczna krztuśca w Polsce w latach 1968-1969 na tle sytuacji światowej.