title: Some intratypic differences between haemagglutinating ECHO viruses.
mesh_terms: D002675:Child, Preschool; D029822:Enterovirus B, Human / Q000145:classification*; D006385:Hemagglutination Inhibition Tests; D006386:Hemagglutination Tests; D006801:Humans; D066298:In Vitro Techniques