title: [Blood group affiliation of positive influenza A2 sera].
mesh_terms: D000017:ABO Blood-Group System; D005859:Germany, East; D006801:Humans; D007106:Immune Sera; D007251:Influenza, Human / Q000276:immunology*
chemical_list: D000017:ABO Blood-Group System; D007106:Immune Sera
vernacular_title: Untersuchungen über die Blutgruppenzugehörigkeit von Influenza A2-Positivseren