title: Observations on antigenic variants of echovirus type 11.
mesh_terms: D000328:Adult; D000941:Antigens; D002675:Child, Preschool; D003168:Complement Fixation Tests; D029822:Enterovirus B, Human / Q000145:classification* / Q000276:immunology* / Q000302:isolation & purification; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D005779:Immunodiffusion; D007223:Infant; D009500:Neutralization Tests
chemical_list: D000941:Antigens