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Streptococci are the most common species in the oral bacterial flora, which are divided into several groups according to the classification of Lancefield. A significant increase in the frequency of necrotizing inflammation and irreversible toxic shock, caused by Streptococci of Group A, has been recently noted. The disease appears in individuals without obvious risk factors, and often becomes serious. In contrast, inflammation caused by β-Streptococci of group F (S. anginosus), however, is usually not frequent nor serious, and has rarely been reported.We encountered a case of acute cervical cellulitis caused by odontogenic infection. A 20-year-old male was referred to our hospital with severe neck swelling and dyspnea. The lesion had extended promptly to the substernal area through the submandibular space and the cervical region, and S. anginosus and the anaerobic bacteria, Peptostreptococci and Clostridium, were detected.The lesion in this patient was managed by drainage and irrigation through incisions in the neck, and systemic antibiotic therapy was performed.In such severe infections, proper drainage and systemic antibiotic treatment are considered to be necessary.

A case of odontogenic mixed infection with Group-F streptococci promptly extending to the substernal area.