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Clindamycin demonstrates clinical effectiveness for severe M1UK Streptococcus pyogenes pneumonia: A case report and in vitro evidence of notable antitoxin effects on M1UK

Ezaki M, Nguyen TM, Kawasuji H, Nagaoka K, Takegoshi Y, Ikeda K, Kanatani J, Oishi K et al.

Research Square, 2025

Abstract

Abstract We report a case of severe M1 UK Streptococcus pyogenes pneumonia that treated with adjunctive clindamycin therapy. In vitro, clindamycin consistently suppressed streptococcal pyrogenic exotoxin A ( speA ) expression in M1 UK , but not in M1 global , and levofloxacin had no suppressive effects, thus underscoring the important antitoxin role of clindamycin in M1 UK infections.

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