Molecular epidemiological investigation of Cryptococcus spp. isolated from cats in Japan using multi-locus sequence typing.

IF 2.7 3区医学 Q3 INFECTIOUS DISEASES

Medical mycology Pub Date : 2024-08-02 DOI:10.1093/mmy/myae085

Miki Omura, Aya Komori, Takashi Tamura, Hock Siew Han, Rui Kano, Koichi Makimura

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Abstract

Cryptococcosis is an important fungal infection for both humans and cats, but molecular epidemiological studies on strains isolated from cats are limited. We conducted multi-locus sequence typing analysis and antifungal susceptibility testing of 14 Cryptococcus spp. strains from domestic cats in Japan and one strain isolated from a cat in Singapore. All 14 strains from domestic cats in Japan were identified as Cryptococcus neoformans molecular type VNI. The sequence types (STs) included eight cases of ST5, five cases of ST31, and one novel ST. VNI ST5 is the most frequently isolated strain in Japanese patients as well, while there are no records of VNI ST31 being isolated from Japanese patients. The Singaporean cat strain was identified as C. gattii VGIIb (C. deuterogattii), ST7. We compared these results with strains previously reported to have been isolated from cats. This comparison suggested that molecular types of Cryptococcus spp. isolated from cats may differ depending on the country. In the antifungal susceptibility testing of C. neoformans, one strain each exceeded the epidemiological cutoff value (ECV) for amphotericin B and 5-fluorocytosine, while two strains exceeded the ECV for fluconazole. This study reveals the molecular epidemiology of Cryptococcus spp. isolated from cats with cryptococcosis in Japan. It suggests that investigating Cryptococcus spp. carried by cats, which share close living environments with humans, may contribute to the health of both cats and human populations.

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利用多焦点序列分型对从日本猫身上分离出的隐球菌属进行分子流行病学调查。

隐球菌病对人类和猫都是一种重要的真菌感染，但对从猫身上分离出的菌株进行的分子流行病学研究却很有限。我们对来自日本家猫的 14 株隐球菌和来自新加坡猫的 1 株隐球菌进行了多焦点序列分型（MLST）分析和抗真菌药敏试验。来自日本家猫的 14 株菌株均被鉴定为新生隐球菌分子类型 VNI。序列类型（ST）包括 8 例 ST5、5 例 ST31 和 1 例新型 ST。VNI ST5 也是日本患者中最常分离到的菌株，而 VNI ST31 则没有从日本患者中分离到的记录。新加坡猫的菌株被鉴定为 C. gattii VGIIb（德氏隐球菌），ST7。我们将这些结果与之前报道的从猫体内分离出的菌株进行了比较。比较结果表明，从猫体内分离出的隐球菌属的分子类型可能因国家不同而不同。在对新生隐球菌的抗真菌药敏试验中，有一株菌株对两性霉素 B 和 5-氟胞嘧啶的药敏试验结果超过了流行病学临界值，有两株菌株对氟康唑的药敏试验结果超过了流行病学临界值。这项研究揭示了日本从患有隐球菌病的猫身上分离出的隐球菌属的分子流行病学。该研究表明，猫与人类共享密切的生活环境，调查猫携带的隐球菌属可能有助于猫和人类的健康。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Medical mycology 医学-兽医学

CiteScore

5.70

自引率

3.40%

发文量

632

审稿时长

12 months

期刊介绍： Medical Mycology is a peer-reviewed international journal that focuses on original and innovative basic and applied studies, as well as learned reviews on all aspects of medical, veterinary and environmental mycology as related to disease. The objective is to present the highest quality scientific reports from throughout the world on divergent topics. These topics include the phylogeny of fungal pathogens, epidemiology and public health mycology themes, new approaches in the diagnosis and treatment of mycoses including clinical trials and guidelines, pharmacology and antifungal susceptibilities, changes in taxonomy, description of new or unusual fungi associated with human or animal disease, immunology of fungal infections, vaccinology for prevention of fungal infections, pathogenesis and virulence, and the molecular biology of pathogenic fungi in vitro and in vivo, including genomics, transcriptomics, metabolomics, and proteomics. Case reports are no longer accepted. In addition, studies of natural products showing inhibitory activity against pathogenic fungi are not accepted without chemical characterization and identification of the compounds responsible for the inhibitory activity.