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Volume 32, Number 7—July 2026

Dispatch

Recurrent Facial Folliculitis Caused by Klebsiella aerogenes Sequence Type 117 in Men who Have Sex with Men

Gentiane Monsel, Alexandre Bleibtreu, François Durupt, Brigitte Rached, Nicolas Yin, Delphine Martiny, Jonathan Krygier, Olivier Chosidow, Landon Porter, Matthieu Godinot, Erwan Turquier, Estelle Hau, Jean-Noël Dauendorffer, Maxime Bonjour, Marie Jachiet, Mathilde Liberge, Béatrice Berçot, Valérie Pourcher, Vincent Bérot, Marion Levast, Olivier Dauwalder, Romain Salle, Sébastien Fouéré, Cécile Brin, Laurent Dortet, and Cécile EmeraudComments to Author 
Author affiliation: Pitié Salpêtrière Hospital, APHP, Paris, France (G. Monsel, A. Bleibtreu, B. Rached, E. Turquier, V. Pourcher, V. Bérot); Dermatologic Infectiology and Sexually Transmitted Infections Working Group of the French Society of Dermatology, Paris (G. Monsel, F. Durupt, J. Krygier, O. Chosidow, J.-N. Dauendorffer, M. Jachiet, V. Bérot, R. Salle, S. Fouéré, C. Brin);, Croix Rousse Hospital, Hospices Civils de Lyon, Lyon, France (F. Durupt, M. Godinot, M. Bonjour, O. Dauwalder); Laboratoire Hospitalier Universitaire de Bruxelles–Universitair Laboratorium Brussel, Université Libre de Bruxelles, Brussels, Belgium (N. Yin, D. Martiny); University of Mons, Mons, Belgium (D. Martiny); St. Pierre University Hospital, Université Libre de Bruxelles, Brussels (J. Krygier); Ambroise Paré-UVSQ and Bicêtre-Paris Saclay Hospitals, APHP, Paris (O. Chosidow); University of Texas at Austin, Austin, Texas, USA (L. Porter); Edouard Herriot Hospital, Hospices Civils de Lyon, Lyon (M. Godinot); Saint Louis Hospital, Paris Cité University, APHP, Paris (E. Hau, J.-N. Dauendorffer, M. Jachiet, M. Liberge, B. Berçot, S. Fouéré); Sorbonne University, INSERM UMR S 1136, Pierre Louis Epidemiology and Public Health Institute, Paris (V. Pourcher); Savoie Metropole Hospital, Chambéry, France (M. Levast, C. Brin); Centre National de Référence des Staphylocoques, Lyon (O. Dauwalder); Centre for Genital and Sexually Transmitted Diseases, Hôtel-Dieu Hospital, APHP, Paris (R. Salle); Kremlin Bicêtre Hospital, APHP, Le Kremlin Bicêtre, France (L. Dortet, C. Emeraud); Associated French National Reference Center for Antibiotic Resistance: Carbapenemase-Producing Enterobacteriaceae, Le Kremlin-Bicêtre (L. Dortet, C. Emeraud); IHU SEPSIS Comprehensive Sepsis Center, Université Paris-Saclay, Le Kremlin Bicêtre (L. Dortet, C. Emeraud)

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Figure 2

SNP-based phylogeny of Klebsiella aerogenes sequence type (ST) 117 and related isolates from study of facial folliculitis in men who have sex with men in France, Belgium, and the United States. Phylogenetic tree shows 24 folliculitis-associated isolates from 17 patients, 4 unrelated ST117 isolates from the French National Reference Center not implicated in folliculitis, and 4 ST117 folliculitis isolates collected in Belgium in 2025 (2). An expanded version of this figure is available online (https://wwwnc.cdc.gov/EID/article/32/7/26-0572-App2.pdf). F-NRC, French National Reference Center; SNP, single-nucleotide polymorphism.

Figure 2. SNP-based phylogeny of Klebsiella aerogenes sequence type (ST) 117 and related isolates from study of facial folliculitis in men who have sex with men in France, Belgium, and the United States. Phylogenetic tree shows 24 folliculitis-associated isolates from 17 patients, 4 unrelated ST117 isolates from the French National Reference Center not implicated in folliculitis, and 4 ST117 folliculitis isolates collected in Belgium in 2025 (2). An expanded version of this figure is available online (https://wwwnc.cdc.gov/EID/article/32/7/26-0572-App2.pdf). F-NRC, French National Reference Center; SNP, single-nucleotide polymorphism.

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References
  1. Bérot  V, Monsel  G, Dauendorffer  J-N, Aubry  A, Nebbad  B, Schneider  P, et al.; Groupe Infectiologie Dermatologique et Infections Sexuellement Transmissibles. (GrIDIST) de la Société Française de Dermatologie. Klebsiella aerogenes-related facial folliculitis in men having sex with men: a hypothetical new STI? J Eur Acad Dermatol Venereol. 2025;39:e10–2. DOIPubMedGoogle Scholar
  2. Yin  N, Krygier  J, Mairesse  C, Libois  A, Quoilin  S, Martiny  D. Klebsiella aerogenes ST117 causing folliculitis in men having sex with men, Belgium, February 2025. Euro Surveill. 2025;30:2500304. DOIPubMedGoogle Scholar
  3. García Muñoz  N, Sáez Vicente  A, Feito Sancho  L, Santa Cruz Martín  A, Folcrá González  M, Tarín Vicente  EJ, et al. Beard folliculitis by Klebsiella aerogenes in a young man: an emergent sexually transmitted infection? Int J STD AIDS. 2026;37:76–8. DOIPubMedGoogle Scholar
  4. Emeraud  C, Mahamat  A, Jousset  AB, Bernabeu  S, Goncalves  T, Pommier  C, et al. Emergence and rapid dissemination of highly resistant NDM-14–producing Klebsiella pneumoniae ST147, France, 2022. Euro Surveill. 2023;28:2300095. DOIPubMedGoogle Scholar
  5. Mason  LCE, Greig  DR, Cowley  LA, Partridge  SR, Martinez  E, Blackwell  GA, et al. The evolution and international spread of extensively drug resistant Shigella sonnei. Nat Commun. 2023;14:1983. DOIPubMedGoogle Scholar
  6. Surgers  L, Chiarabini  T, Royer  G, Rougier  H, Mercier-Darty  M, Decré  D, et al. Evidence of sexual transmission of extended-spectrum β-lactamase–producing Enterobacterales: a cross-sectional and prospective study. Clin Infect Dis. 2022;75:1556–64. DOIPubMedGoogle Scholar
  7. Gaudreau  C, Rodrigues-Coutlée  S, Pilon  PA, Coutlée  F, Bekal  S. Long-lasting outbreak of erythromycin- and ciprofloxacin-resistant Campylobacter jejuni subspecies jejuni from 2003 to 2013 in men who have sex with men, Quebec, Canada. Clin Infect Dis. 2015;61:1549–52. DOIPubMedGoogle Scholar
  8. Jabet  A, Dellière  S, Seang  S, Chermak  A, Schneider  L, Chiarabini  T, et al. Sexually transmitted Trichophyton mentagrophytes genotype VII infection among men who have sex with men. Emerg Infect Dis. 2023;29:1411–4. DOIPubMedGoogle Scholar
  9. Allan-Blitz  LT, Gandhi  M, Adamson  P, Park  I, Bolan  G, Klausner  JD. A position statement on mpox as a sexually transmitted disease. Clin Infect Dis. 2023;76:1508–12. DOIPubMedGoogle Scholar
  10. Raccagni  AR, Castagna  A, Nozza  S. When is it a sexually transmitted infection? Intimate contact transmission of pathogens not traditionally defined as STIs. Curr Opin Infect Dis. 2025;38:65–70. DOIPubMedGoogle Scholar
  11. Neubert  U, Jansen  T, Plewig  G. Bacteriologic and immunologic aspects of gram-negative folliculitis: a study of 46 patients. Int J Dermatol. 1999;38:270–4. DOIPubMedGoogle Scholar
  12. James  WD, Leyden  JJ. Treatment of gram-negative folliculitis with isotretinoin: positive clinical and microbiologic response. J Am Acad Dermatol. 1985;12:319–24. DOIPubMedGoogle Scholar
  13. Dreno  B, Dekio  I, Baldwin  H, Demessant  AL, Dagnelie  MA, Khammari  A, et al. Acne microbiome: from phyla to phylotypes. J Eur Acad Dermatol Venereol. 2024;38:657–64. DOIPubMedGoogle Scholar
  14. Cheng  Q, Ma  Z, Gong  Z, Liang  Y, Guo  J, Ye  X, et al. Whole-genome sequencing analysis of Klebsiella aerogenes among men who have sex with men in Guangzhou, China. Front Microbiol. 2023;14:1102907. DOIPubMedGoogle Scholar
  15. Feng  Y, Yang  Y, Hu  Y, Xiao  Y, Xie  Y, Wei  L, et al. Population genomics uncovers global distribution, antimicrobial resistance, and virulence genes of the opportunistic pathogen Klebsiella aerogenes. Cell Rep. 2024;43:114602. DOIPubMedGoogle Scholar

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