[Protective effect of vaccination in the influenza A 2  epidemic in the year 1968].
D003604:Czechoslovakia; D004196:Disease Outbreaks; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control*; D012572:School Health Services; D012698:Serologic Tests
D007252:Influenza Vaccines
Ochranný efekt vakcinácie pri epidémi chrípky A 2  v roku 1968.