Streptococcal Pyrogenic Exotoxin B Enhances Tissue Damage Initiated by OtherStreptococcus pyogenesProducts

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Abstract
This study compared the pathology and infection pattern of streptococcal pyrogenic exotoxin B–positive (SpeB+) and SpeB-negative (SpeB−) isogenic variants of an M1 isolate of Streptococcus pyogenes in a mouse skin air sac model. SpeB+ strains resulted in severe local tissue damage that extended from the epidermis through the subcutaneous layers, whereas isogenic SpeB− variants had reduced gross pathology. At the histologic level, differences in necrosis and host responses to each variant were apparent. Injection of purified SpeB alone into a skin air sac failed to induce any significant tissue damage; however, coinjection of the enzyme with either the wild-type or the speB mutant resulted in increased and accelerated tissue necrosis. Surprisingly, coinjection of the enzyme with the spleen-recovered SpeB− variant failed to induce a lesion

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