The Presence of a Virulence Factor in M Protein Extracts of Group A Streptococci: 1. The Enhancement of Virulence of Homologous Streptococci by these Extracts

Robert I. Krasner, Genevieve Young, Rosemary Heitmann; The Presence of a Virulence Factor in M Protein Extracts of Group A Streptococci: 1. The Enhancement