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Chinese Journal of Mycology 2020, Vol. 15  Issue (2): 93-96.

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In vitro antifungal susceptibility of polyhexamethylene biguanide against common superficial fungal species

TAN Jing-wen1, XU Hong2, SONG Jin-feng1, GAO Zhi-qin1, YANG Hong1, YANG Lian-juan1, WEN Hai2   

  1. 1. Department of Medical Mycology, Shanghai Dermatology Hospital, 200443 Shanghai, China;
    2. Department of Dermatology, Shanghai Changzheng Hospital, Second Affiliated Hospital of Naval Military Medical University, 200003 Shanghai, China
  • Received:2020-01-07 Online:2020-04-28 Published:2020-04-28

Abstract:

Objective To determine the in vitro antifungal susceptibility of polyhexamethylene biguanide (PHMB) against common superficial fungal species. Methods We used the standard broth microdilution method and agar dilution method to evaluate the minimal inhibitory concentration (MIC) and minimal fungicidal concentration (MFC) of PHMB against the clinical isolates of Trichophyton rubrum, T. mentagrophytes, Microsporum canis and Candida albicans. Results Broth microdilution method showed that MIC range of PHMB powder against T. rubrum was 1.0~4.0 μg/mL, the MFC range was 2.0~8.0 μg/mL. The MIC range of T. mentagrophytes was 2.0~4.0 μg/mL and the MFC was 4.0 μg/mL. To M. canis the MIC range was 2.0~4.0 μg/mL and MFC range was 2.0~4.0 μg/mL. To C. albicans the MIC range turned out to be 0.3~5.0 μg/mL and the MFC range was 5.0~10.0 μg/mL. The agar dilution method showed there were none T. rubrum, T. mentagrophytes and M.canis colony growth on agar plate when PHMB liquid at the concentration of 1.25%. There was none C. albicans colony growth at the concentration of 0.32%. After added the penetration enhancer of azone, the result showed no difference. Conclusions PHMB showed great in vitro efficacy against T. rubrum, T. mentagrophytes, M. canis and C. albicans, suggesting a potential therapeutic choice for treatment of superficial fungal infection.

Key words: polyhexamethylene biguanide (PHMB), Trichophyton rubrum, Trichophyton mentagrophytes, Microsporum canis, Candida albicans

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