Klebsiella aerogenes ST117 causing folliculitis in men having sex with men, Belgium, February 2025

<i>Klebsiella aerogenes</i> has recently been reported as a causative agent of folliculitis in men who have sex with men (MSM). We present four cases of folliculitis in MSM diagnosed in Brussels, Belgium. Patients were aged between 25 and 50 years, and all were infected by a single multilocus sequence type (ST117) strain. This strain carried the yersiniabactin siderophore genes. Following a preliminary treatment by sulfamethoxazole-trimethoprim for 7-14 days, all patients experienced a recurrence of symptoms, necessitating an extended therapeutic regimen.