title: On the nature of the haemagglutinating factor in some strains of ECHO 7 and 12 viruses.
mesh_terms: D000906:Antibodies; D000941:Antigens / Q000032:analysis*; D002130:Calcium Phosphates; D002482:Cellulose; D002845:Chromatography; D046508:Culture Techniques; D003588:Cytopathogenic Effect, Viral; D029822:Enterovirus B, Human / Q000276:immunology*; D014461:Ultracentrifugation
chemical_list: D000906:Antibodies; D000941:Antigens; D002130:Calcium Phosphates; D002482:Cellulose