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Samples were taken from blood accumulated in dental alveoli after surgical removal of mandibular third molars, from subgingival plaque of teeth with advanced periodontal destructions, from teeth with infected necrotic pulps, and from subjects suffering from angular cheilitis. Of the microorganisms subcultured from these samples, 116 strains were assayed for enzymes degrading fibrinogen and fibrin. Enzymes degrading fibrinogen were assayed with the thin-layer enzyme assay cultivation technique. This assay involves the cultivation of microorganisms on culture agars applied over fibrinogen-coated polystyrene surfaces. Enzymes degrading fibrin were assayed with both a plate assay and a tube assay, in which fibrin was mixed with a microbial culture medium. Microorganisms degrading fibrinogen or fibrin or both were isolated from all sampling sites. Activity was mainly detected in strains of Actinomyces, Bacteroides, Fusobacterium, Peptococcus, Propionibacterium, and Staphylococcus aureus. Most Fusobacterium strains degraded fibrinogen only. Enzymes degrading fibrinogen as well as enzymes degrading fibrin via activation of plasminogen were revealed in strains of Clostridium, S. aureus, and Streptococcus pyogenes. It was generally found that fibrinogen was degraded by more strains than was fibrin, which indicates that different proteases may be involved.

Fibrinogenolytic and fibrinolytic activity in oral microorganisms