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During a bacteriological examination of materials from slaughtered swine, we isolated from hemorrhagic and markedly edematous mandibular lymph nodes strains of hemolytic streptococci belonging to groups C, E, L, S, and U; also isolated were beta-hemolytic strains that were not classifiable within any of the known serological groups A to U. Hyperimmune sera prepared with these strains contain antibodies that are specific in the homologous system only and are distinct from antibodies against group A to U strains. The strains were investigated for their biochemical and physiological properties. On the basis of the characters determined and because of repeated isolations made in different localities, it is proposed that the strains are representatives of a new serological group of hemolytic streptococci, for which we propose the designation "V."

Proposal of a New Serological Group ("V") of Hemolytic Streptococci Isolated from Swine Lymph Nodes