Clindamycin demonstrates clinical effectiveness for bacteremic M1UKStreptococcus 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.

International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases, 2026

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Abstract

We report a case of bacteremic M1 UK Streptococcus pyogenes pneumonia in an immunocompetent patient, which improved with adjunctive clindamycin therapy. In vitro, clindamycin consistently suppressed expression of streptococcal pyrogenic exotoxin A ( speA ) in M1 UK strains but not in the M1 global strain, whereas levofloxacin showed no suppressive effect. These findings support a potential antitoxin role of clindamycin in M1 UK infections.

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