[Critical titre of hemagglutination inhibition antibodies in apparent measles infection].
D000293:Adolescent; D002681:China; D006385:Hemagglutination Inhibition Tests; D006389:Hemagglutinins, Viral / Q000276:immunology*; D006801:Humans; D008457:Measles / Q000276:immunology*; D008459:Measles virus / Q000276:immunology*
D006389:Hemagglutinins, Viral