title: The assay of pneumococcal capsular polysaccharide by immunodiffusion.
mesh_terms: D005779:Immunodiffusion; D008722:Methods; D011135:Polysaccharides, Bacterial / Q000032:analysis*; D011233:Precipitin Tests; D013296:Streptococcus pneumoniae / Q000276:immunology
chemical_list: D011135:Polysaccharides, Bacterial