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In Vitro Antifungal Activity of Azoles and Other Antifungal Agents Against Pathogenic Yeasts from Vulvovaginal Candidiasis in China

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Abstract

Background

Vulvovaginal candidiasis (VVC) is a public health issue worldwide. Little is known of the optimal treatment of recurrent VVC (RVVC) has not been established.

Objective

Through the in vitro antifungal susceptibility profiling of VVC isolates, we hope to foster significant improvements in the control and treatment of this disease.

Methods

Candida isolates from VVC patients were collected from 12 hospitals in 10 cities across China. Species were identified by phenotype analysis and DNA sequencing. Species were identified by phenotype analysis and DNA sequencing. Susceptibilities to 11 drugs were determined by Clinical and Laboratory Standards Institute broth microdilution.

Results

543 strains were isolated from those VVC patients enrolled in this study, of which, 15.7% were from RVVC. The most commonly identified species was C. albicans (460, 84.71%), and the most commonly non-albicans Candida spp. (NAC) was C. glabrata (47, 8.66%). NAC also included C. Krusei, Meyerozyma Guillermondii, Meyerozyma Caribbica, C. Tropicalis, C. Parapsilosis, and C. Nivariensis. Most C. albicans isolates were susceptible to caspofungin (99.8%), followed by fluconazole (92%) and voriconazole (82.6%). The proportion of C. albicans strains with wild type (WT) MICs that were susceptible to amphotericin B and caspofungin were 98%, followed by posaconazole at 95%, itraconazole at 86%, fluconazole at 74% and voriconazole at 54%. The fluconazole MICs for C. albicans were lower than those for NAC (P < 0.05), while the itraconazole MICs showing no significant difference (P > 0.05). The susceptible rate of uncomplicated VVC to fluconazole was 92%. The proportion of WT strains to fluconazole in RVVC was much lower than that in other types of VVC (67 vs. 77%, P < 0.05). However, the proportions of WT strains to itraconazole in RVVC was over 85%, which was much higher than that to fluconazole (87 vs. 67%, P < 0.05).

Conclusions

C. albicans was still the predominant pathogen for VVC in China, while C. glabrata was the main species in NAC. Fluconazole could still be used as an empirical treatment for uncomplicated VVC. However, fluconazole may not be the first choice for the therapy of RVVC. In such cases, itraconazole appears to be the more appropriate treatment. As for VVC caused by NAC, nonfluconazole drugs, such as itraconazole, may be a good choice.

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Acknowledgements

We thank all patients that took part in this survey and the doctors who collected specimens and data. We thank Prof. Shen yongnian for his guidance on the experiment.

Funding

This study was supported by the National Science and Technology Major Project (No. 2018ZX10734404), the CAMS Initiative for Innovative Medicine (No. 2016-I2M-3-021), National Natural Science Foundation of China (No. 81573059), the Basical Scientific Research Fund Projects of Chinese Academy of Medical Sciences (No. 2018PT31013) and Nanjing Clinical Medicine Research Center Project (No.2019060001).

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LXF, LWD, LQP, and SYN designed the study. ARF, LP, XZG, FSR, ZMZ, CYH, QQ, LXD, CMH, and LDY collected samples and data. KSY, PQY, SNN, ZHL, MH, and LGX did culture, identification of Candida spp. and drug susceptibility test. SNN did PCR, sequencing, and blast. KSY analyzed data and wrote the article. LXF, LWD, and LDM provided revisions.

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Correspondence to Xiaofang Li or Weida Liu.

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Kan, S., Song, N., Pang, Q. et al. In Vitro Antifungal Activity of Azoles and Other Antifungal Agents Against Pathogenic Yeasts from Vulvovaginal Candidiasis in China. Mycopathologia 188, 99–109 (2023). https://doi.org/10.1007/s11046-022-00687-w

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