title: The presence of a virulence factor in group A streptococcal acid extracts. 2. The enhancement of virulence of heterologous streptococci and other organisms by these extracts.
mesh_terms: D000818:Animals; D000941:Antigens; D001412:Bacillus subtilis / Q000472:pathogenicity*; D004926:Escherichia coli / Q000472:pathogenicity*; D006851:Hydrochloric Acid; D051379:Mice; D010587:Phagocytosis; D011233:Precipitin Tests; D012482:Salmonella paratyphi A / Q000472:pathogenicity*; D013210:Staphylococcus / Q000472:pathogenicity*; D013291:Streptococcus / Q000472:pathogenicity*; D014774:Virulence
chemical_list: D000941:Antigens; D006851:Hydrochloric Acid