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1887

Journal of Medical Microbiology logo Journal of Medical Microbiology

Volume 74, Issue 11

efficacy of disinfectants against Open Access

Abstract

The abnormal proliferation of , a human skin commensal bacterium, aggravates acne. Prompt and aggressive treatment of acne in its initial stages is essential because of the increased psychological distress experienced by patients. Over-the-counter medications containing disinfectants are sometimes used to treat acne because they are widely available, exhibit broad-spectrum activity and have a likelihood of causing resistance.

Limited information is available regarding the bactericidal effects of disinfectants against .

In the present study, we comprehensively evaluated the efficacy of various disinfectants.

ATCC6919 and eight clinical isolates with different genotypes obtained from patients with acne were used. Benzethonium, chlorhexidine, resorcinol, homosulfamine, isopropyl methylphenol and olanexidine were used as disinfectants. The bactericidal activity of these disinfectants against was assessed using a time–kill kinetic assay. Three independent experiments were conducted to ensure reproducibility of the results.

Benzethonium, chlorhexidine, isopropyl methylphenol and olanexidine exhibited high efficacy. However, under acne conditions, with the addition of artificial sebum, the bactericidal efficacy of the disinfectants was significantly reduced. However, olanexidine retained bactericidal activity at concentrations as low as 0.2%, comparable with that at 1.5%.

This study showed that the disinfectants benzethonium, isopropyl methylphenol, chlorhexidine and olanexidine have high bactericidal activity against . In particular, olanexidine demonstrated a strong bactericidal effect even under acne conditions. Further validation is required to determine whether olanexidine could be a new treatment option for managing acne.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): acne vulgaris , Cutibacterium acnes , disinfectants , olanexidine and over the counter (OTC)
Funding
This study was supported by the:
  • Otsuka Pharmaceutical Factory
    • Principal Award Recipient: KoyoYoshihara
© 2025 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2025-11-20
2025-12-15

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/content/journal/jmm/10.1099/jmm.0.002100
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In vitro efficacy of disinfectants against Cutibacterium acnes
J. Med. Microbiol. 74, 002100 (2025); https://doi.org/10.1099/jmm.0.002100
/content/journal/jmm/10.1099/jmm.0.002100
/content/journal/jmm/10.1099/jmm.0.002100
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