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Taha M, Tartor YH, Elaziz RMA, Elsohaby I. Genetic diversity and antifungal susceptibilities of environmental Cryptococcus neoformans and Cryptococcus gattii species complexes. IMA Fungus 2024; 15:21. [PMID: 39060926 PMCID: PMC11282759 DOI: 10.1186/s43008-024-00153-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 07/05/2024] [Indexed: 07/28/2024] Open
Abstract
Cryptococcosis is an opportunistic systemic mycosis caused by Cryptococcus neoformans and C. gattii species complexes and is of increasing global importance. Maintaining continued surveillance of the antifungal susceptibility of environmental C. neoformans and C. gattii isolates is desirable for better managing cryptococcosis by identifying resistant isolates and revealing the emergence of intrinsically resistant species. Relevant research data from Egypt are scarce. Thus, this study aimed to report the genetic diversity of C. neoformans and C. gattii species complexes originating from different environmental sources in Egypt, antifungal susceptibility profiles, antifungal combinations, and correlations of susceptibility with genotypes. A total of 400 environmental samples were collected, 220 from birds and 180 from trees. Cryptococcus spp. were found in 58 (14.5%) of the samples, 44 (75.9%) of the isolates were recovered from birds and 14 (24.1%) from trees. These isolates were genotyped using M13 polymerase chain reaction-fingerprinting and URA5 gene restriction fragment length polymorphism analysis. Of the 31 C. neoformans isolates, 24 (77.4%), 6 (19.4%) and one (4.4%) belonged to VNI, VNII, and VNIII genotypes, respectively. The 27 C. gattii isolates belonged to VGI (70.4%), VGII (18.5%), and VGIII (11.1%) genotypes. Non-wild type C. neoformans and C. gattii isolates that may have acquired resistance to azoles, amphotericin B (AMB), and terbinafine (TRB) were observed. C. gattii VGIII was less susceptible to fluconazole (FCZ) and itraconazole (ITZ) than VGI and VGII. C. neoformans isolates showed higher minimum inhibitory concentrations (MICs) to FCZ, ITZ, and voriconazole (VRZ) than those of C. gattii VGI and VGII. Significant (P < 0.001) correlations were found between the MICs of VRZ and ITZ (r = 0.64) in both C. neoformans and C. gattii isolates, FCZ and TRB in C. neoformans isolates, and FCZ and TRB (r = 0.52) in C. gattii isolates.There is no significant differences in the MICs of TRB in combination with FCZ (P = 0.064) or in combination with AMB (P = 0.543) and that of TRB alone against C. gattii genotypes. By calculating the fractional inhibitory concentration (FIC) index, the combination of FCZ + AMB was synergistic against all tested genotypes. These findings expand our knowledge of ecological niches, genetic diversity, and resistance traits of C. neoformans and C. gattii genotypes in Egypt. Further investigations into how they are related to clinical isolates in the region are warranted.
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Affiliation(s)
- Mohamed Taha
- Department of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, 44511, Egypt
| | - Yasmine H Tartor
- Department of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, 44511, Egypt.
| | - Rana M Abd Elaziz
- Cairo International Airport Veterinary Quarantine, General Organization for Veterinary Services, Ministry of Agriculture, Cairo, Egypt
| | - Ibrahim Elsohaby
- Department of Infectious Diseases and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Hong Kong SAR, China
- Centre for Applied One Health Research and Policy Advice (OHRP), City University of Hong Kong, Hong Kong, Hong Kong SAR, China
- Department of Animal Medicine, Faculty of Veterinary Medicine, Zagazig University, Zagazig, 44511, Egypt
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Pintye A, Bacsó R, Kovács GM. Trans-kingdom fungal pathogens infecting both plants and humans, and the problem of azole fungicide resistance. Front Microbiol 2024; 15:1354757. [PMID: 38410389 PMCID: PMC10896089 DOI: 10.3389/fmicb.2024.1354757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 01/23/2024] [Indexed: 02/28/2024] Open
Abstract
Azole antifungals are abundantly used in the environment and play an important role in managing fungal diseases in clinics. Due to the widespread use, azole resistance is an emerging global problem for all applications in several fungal species, including trans-kingdom pathogens, capable of infecting plants and humans. Azoles used in agriculture and clinics share the mode of action and facilitating cross-resistance development. The extensive use of azoles in the environment, e.g., for plant protection and wood preservation, contributes to the spread of resistant populations and challenges using these antifungals in medical treatments. The target of azoles is the cytochrome p450 lanosterol 14-α demethylase encoded by the CYP51 (called also as ERG11 in the case of yeasts) gene. Resistance mechanisms involve mainly the mutations in the coding region in the CYP51 gene, resulting in the inadequate binding of azoles to the encoded Cyp51 protein, or mutations in the promoter region causing overexpression of the protein. The World Health Organization (WHO) has issued the first fungal priority pathogens list (FPPL) to raise awareness of the risk of fungal infections and the increasingly rapid spread of antifungal resistance. Here, we review the main issues about the azole antifungal resistance of trans-kingdom pathogenic fungi with the ability to cause serious human infections and included in the WHO FPPL. Methods for the identification of these species and detection of resistance are summarized, highlighting the importance of these issues to apply the proper treatment.
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Affiliation(s)
- Alexandra Pintye
- Centre for Agricultural Research, Plant Protection Institute, HUN-REN, Budapest, Hungary
- Department of Plant Anatomy, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
| | - Renáta Bacsó
- Centre for Agricultural Research, Plant Protection Institute, HUN-REN, Budapest, Hungary
| | - Gábor M. Kovács
- Centre for Agricultural Research, Plant Protection Institute, HUN-REN, Budapest, Hungary
- Department of Plant Anatomy, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
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Zhang L, Wang S, Hong N, Li M, Liu Y, Zhou T, Peng Y, Hu C, Li X, Zhang Z, Guo M, Cogliati M, Hitchcock M, Xu J, Chen M, Liao G. Genotypic diversity and antifungal susceptibility of Cryptococcus neoformans species complex from China, including the diploid VNIII isolates from HIV-infected patients in Chongqing region. Med Mycol 2023; 61:myad119. [PMID: 37985734 DOI: 10.1093/mmy/myad119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 11/07/2023] [Accepted: 11/15/2023] [Indexed: 11/22/2023] Open
Abstract
Although previous studies on the genotypic diversity and antifungal susceptibility of the Cryptococcus neoformans species complex (CNSC) isolates from China revealed ST5 genotype isolates being dominant, the information about the CNSC isolates from Chinese HIV-infected patients is limited. In this study, 171 CNSC isolates from HIV-infected patients in the Chongqing region of Southwest China were genotyped using the International Society for Human and Animal Mycology-multilocus sequence typing consensus scheme, and their antifungal drug susceptibilities were determined following CLSI M27-A3 guidelines. Among 171 isolates, six sequence types (STs) were identified, including the dominant ST5 isolates, the newly reported ST15, and four diploid VNIII isolates (ST632/ST636). Moreover, a total of 1019 CNSC isolates with STs and HIV-status information were collected and analyzed from Mainland China in the present study. A minimum spanning analysis grouped these 1019 isolates into three main subgroups, which were dominated by the ST5 clonal complex (CC5), followed by the ST31 clonal complex (CC31) and ST93 clonal complex (CC93). The trend of resistance or decreasing susceptibility of clinical CNSC isolates to azole agents within HIV-infected patients from the Chongqing region is increasing, especially resistance to fluconazole.
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Affiliation(s)
- Lanyu Zhang
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Saisai Wang
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Nan Hong
- Department of Dermatology, Jinling Hospital, School of Medicine of Nanjing University, Nanjing, China
| | - Muyuan Li
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Yiting Liu
- Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Tao Zhou
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Yan Peng
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Changhua Hu
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Xiaoxu Li
- The Medical Research Institute (MRI), Southwest University, Chongqing, China
| | - Zhen Zhang
- Department of Clinical Laboratory, Chongqing General Hospital, Chongqing, China
| | - Mengzhu Guo
- Department of Dermatology, General Hospital of Southern Theatre Command, Guangzhou, China
| | - Massimo Cogliati
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milano, Italy
| | - Megan Hitchcock
- Department of Biology, McMaster University, Hamilton, Canada
| | - Jianping Xu
- Department of Biology, McMaster University, Hamilton, Canada
| | - Min Chen
- Department of Dermatology, Shanghai Key Laboratory of Molecular Medical Mycology, Changzheng Hospital, Shanghai, China
| | - Guojian Liao
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
- The Medical Research Institute (MRI), Southwest University, Chongqing, China
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Characteristics and prognostic risk factors of patients with sequence type 5 lineage-associated cryptococcosis in China. Int J Infect Dis 2023; 128:244-253. [PMID: 36646413 DOI: 10.1016/j.ijid.2023.01.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 01/04/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023] Open
Abstract
OBJECTIVES Cryptococcus neoformans sequence type 5 (ST5) lineage could infect immunocompetent hosts and cause a significant medical burden. We sought to identify characteristics and prognostic risk factors of ST5 lineage-associated cryptococcosis. METHODS Multilocus sequence typing and antifungal susceptibility testing were conducted for Cryptococcus isolates. The clinical and laboratory characteristics of cryptococcosis patients were investigated. The multivariable logistic regression identified variables independently associated with 30-day mortality in patients with ST5 lineage-associated cryptococcosis without HIV. RESULTS The infection rate of the ST5 isolates was 89.4% (370/414) in China. The proportion of ST5 isolates with nonwild-type minimum inhibitory concentrations to amphotericin B, 5-flucytosine, voriconazole, posaconazole, itraconazole, and fluconazole were 0%, 5.4%, 0.3%, 1.4%, 0.3%, and 8.1%, respectively. The ST5 lineage-infected group exhibited significantly higher blood platelet count, lower blood cryptococcal antigen (CrAg) titer, lower cerebrospinal fluid (CSF) CrAg titer than the non-ST5 lineage-infected group, and lower hemoglobin and lower CSF CrAg titer than the Cryptococcus gattii isolates-infected group. Seven baseline parameters, including underlying disease, dyskinesia, anemia, high peripheral blood neutrophils, low platelet count, high CSF fungal burden, and high CSF opening pressure, were associated independently with the 30-day mortality of patients with ST5 lineage-associated cryptococcosis without HIV. CONCLUSION Our study has provided an understanding of the ST5 lineage associated with cryptococcosis.
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Hitchcock M, Xu J. Analyses of the Global Multilocus Genotypes of the Human Pathogenic Yeast Cryptococcus neoformans Species Complex. Genes (Basel) 2022; 13:2045. [PMID: 36360282 PMCID: PMC9691084 DOI: 10.3390/genes13112045] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/03/2022] [Accepted: 11/04/2022] [Indexed: 12/18/2023] Open
Abstract
Cryptococcus neoformans species complex (CNSC) is a globally distributed human opportunistic yeast pathogen consisting of five major molecular types (VNI, VNII, VNB, VNIII and VNIV) belonging to two species, C. neoformans (VNI, VNII and VNB, collectively called serotype A) and C. deneoformans (VNIV, commonly called serotype D), and their hybrids (VNIII, serotype AD). Over the years, many studies have analyzed the geographical distribution and genetic diversity of CNSC. However, the global population structure and mode of reproduction remain incompletely described. In this study, we analyze the published multilocus sequence data at seven loci for CNSC. The combined sequences at the seven loci identified a total of 657 multilocus sequence types (STs), including 296 STs with known geographic information, representing 4200 non-redundant isolates from 31 countries and four continents. Among the 296 STs, 78 and 52 were shared among countries and continents, respectively, representing 3643 of the 4200 isolates. Except for the clone-corrected serotype D sample among countries, our analysis of the molecular variance of the 4200 isolates revealed significant genetic differentiations among countries and continents in populations of CNSC, serotype A, and serotype D. Phylogenetic analyses of the concatenated sequences of all 657 STs revealed several large clusters corresponding to the major molecular types. However, several rare but distinct STs were also found, representing potentially novel molecular types and/or hybrids of existing molecular types. Phylogenetic incompatibility analyses revealed evidence for recombination within all four major molecular types-VNI, VNII, VNIV and VNB-as well as within two VNB subclades, VNBI and VNBII, and two ST clusters around the most common STs, ST5 and ST93. However, linkage disequilibrium analyses rejected the hypothesis of random recombination across most samples. Together, our results suggest evidence for historical differentiation, frequent recent gene flow, clonal expansion and recombination within and between lineages of the global CNSC population.
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Affiliation(s)
| | - Jianping Xu
- Department of Biology, McMaster University, Hamilton, ON L8S 4K1, Canada
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Zhou Z, Zhu C, Ip M, Liu M, Zhu Z, Liu R, Li X, Zeng L, Wu W. Molecular Epidemiology and Antifungal Resistance of Cryptococcus neoformans From Human Immunodeficiency Virus-Negative and Human Immunodeficiency Virus-Positive Patients in Eastern China. Front Microbiol 2022; 13:942940. [PMID: 35865921 PMCID: PMC9294546 DOI: 10.3389/fmicb.2022.942940] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 06/13/2022] [Indexed: 11/17/2022] Open
Abstract
Cryptococcosis is an opportunistic and potentially lethal infection caused by Cryptococcus neoformans and Cryptococcus gattii complex, which affects both immunocompromised and immunocompetent people, and it has become a major public health concern worldwide. In this study, we characterized the molecular epidemiology and antifungal susceptibility of 133 C. neoformans isolates from East China Invasive Fungal Infection Group (ECIFIG), 2017–2020. Isolates were identified to species level by matrix-assisted laser desorption ionization-time of flight mass spectrometry and confirmed by IGS1 sequencing. Whole-genome sequencing (WGS) was conducted on three multidrug-resistant isolates. Among the 133 strains, 61 (45.86%) were isolated from HIV-positive patients and 72 (54.16%) were isolated from HIV-negative patients. In total, C. neoformans var. grubii accounted for 97.74% (130/133), while C. neoformans var. neoformans was rare (2.06%, 3/133). The strains were further classified into nine sequence types (STs) dominated by ST5 (90.23%, 120/133) with low genetic diversity. No association was observed between STs and HIV status. All strains were wild type to voriconazole, while high antifungal minimal inhibitory concentrations (MICs) above the epidemiological cutoff values (ECVs) were observed in C. neoformans strains, and more than half of isolates were non-wild-type to amphotericin B (89.15%, 109/133). Eight isolates were resistant to fluconazole, and eight isolates were non-wild type to 5-fluorocytosine. Furthermore, WGS has verified the novel mutations of FUR1 in 5-fluorocytosine-resistant strains. In one isolate, aneuploidy of chromosome 1 with G484S mutation of ERG11 was observed, inducing high-level resistance (MIC: 32 μg/ml) to fluconazole. In general, our data showed that there was no significant difference between HIV-positive and HIV-negative patients on STs, and we elucidate the resistant mechanisms of C. neoformans from different perspectives. It is important for clinical therapy and drug usage in the future.
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Affiliation(s)
- Ziyi Zhou
- Department of Laboratory Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Chendi Zhu
- Department of Microbiology, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Margaret Ip
- Department of Microbiology, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Manjiao Liu
- State Key Laboratory of Translational Medicine and Innovative Drug Development, Jiangsu Simcere Diagnostics Co., Ltd., Nanjing, China
| | - Zhaoqin Zhu
- Shanghai Public Health Clinical Center, Shanghai, China
| | - Ryon Liu
- State Key Laboratory of Translational Medicine and Innovative Drug Development, Jiangsu Simcere Diagnostics Co., Ltd., Nanjing, China
| | - Xiaomin Li
- State Key Laboratory of Translational Medicine and Innovative Drug Development, Jiangsu Simcere Diagnostics Co., Ltd., Nanjing, China
| | - Lingbing Zeng
- Department of Laboratory Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, China
- *Correspondence: Lingbing Zeng,
| | - Wenjuan Wu
- Department of Laboratory Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
- Wenjuan Wu,
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Chen M, Al-Hatmi AMS, Xu J, De Hoog GS. Editorial: Molecular Epidemiology of Fungal Infections. Front Cell Infect Microbiol 2022; 12:939140. [PMID: 35711661 PMCID: PMC9195173 DOI: 10.3389/fcimb.2022.939140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Accepted: 05/12/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Min Chen
- Department of Dermatology, Shanghai Key Laboratory of Medical Mycology, Changzheng Hospital, Shanghai, China
| | - Abdullah M. S. Al-Hatmi
- Natural & Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
- Center of Expertise in Mycology, Radboud University Medical Center/Canisius Wilhelmina Hospital, Nijmegen, Netherlands
| | - Jianping Xu
- Department of Biology, McMaster University, Hamilton, ON, Canada
- *Correspondence: G. Sybren De Hoog, ; Jianping Xu,
| | - G. Sybren De Hoog
- Center of Expertise in Mycology, Radboud University Medical Center/Canisius Wilhelmina Hospital, Nijmegen, Netherlands
- *Correspondence: G. Sybren De Hoog, ; Jianping Xu,
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Bastos RW, Rossato L, Goldman GH, Santos DA. Fungicide effects on human fungal pathogens: Cross-resistance to medical drugs and beyond. PLoS Pathog 2021; 17:e1010073. [PMID: 34882756 PMCID: PMC8659312 DOI: 10.1371/journal.ppat.1010073] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Fungal infections are underestimated threats that affect over 1 billion people, and Candida spp., Cryptococcus spp., and Aspergillus spp. are the 3 most fatal fungi. The treatment of these infections is performed with a limited arsenal of antifungal drugs, and the class of the azoles is the most used. Although these drugs present low toxicity for the host, there is an emergence of therapeutic failure due to azole resistance. Drug resistance normally develops in patients undergoing azole long-term therapy, when the fungus in contact with the drug can adapt and survive. Conversely, several reports have been showing that resistant isolates are also recovered from patients with no prior history of azole therapy, suggesting that other routes might be driving antifungal resistance. Intriguingly, antifungal resistance also happens in the environment since resistant strains have been isolated from plant materials, soil, decomposing matter, and compost, where important human fungal pathogens live. As the resistant fungi can be isolated from the environment, in places where agrochemicals are extensively used in agriculture and wood industry, the hypothesis that fungicides could be driving and selecting resistance mechanism in nature, before the contact of the fungus with the host, has gained more attention. The effects of fungicide exposure on fungal resistance have been extensively studied in Aspergillus fumigatus and less investigated in other human fungal pathogens. Here, we discuss not only classic and recent studies showing that environmental azole exposure selects cross-resistance to medical azoles in A. fumigatus, but also how this phenomenon affects Candida and Cryptococcus, other 2 important human fungal pathogens found in the environment. We also examine data showing that fungicide exposure can select relevant changes in the morphophysiology and virulence of those pathogens, suggesting that its effect goes beyond the cross-resistance.
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Affiliation(s)
- Rafael W. Bastos
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto-SP, Brazil
| | - Luana Rossato
- Federal University of Grande Dourados, Dourados-MS, Brazil
| | - Gustavo H. Goldman
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto-SP, Brazil
| | - Daniel A. Santos
- Laboratory of Mycology, Federal University of Minas Gerais, Belo Horizonte-MG, Brazil
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Associations between Cryptococcus Genotypes, Phenotypes, and Clinical Parameters of Human Disease: A Review. J Fungi (Basel) 2021; 7:jof7040260. [PMID: 33808500 PMCID: PMC8067209 DOI: 10.3390/jof7040260] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 03/25/2021] [Accepted: 03/25/2021] [Indexed: 12/11/2022] Open
Abstract
The genus Cryptococcus contains two primary species complexes that are significant opportunistic human fungal pathogens: C. neoformans and C. gattii. In humans, cryptococcosis can manifest in many ways, but most often results in either pulmonary or central nervous system disease. Patients with cryptococcosis can display a variety of symptoms on a spectrum of severity because of the interaction between yeast and host. The bulk of our knowledge regarding Cryptococcus and the mechanisms of disease stem from in vitro experiments and in vivo animal models that make a fair attempt, but do not recapitulate the conditions inside the human host. To better understand the dynamics of initiation and progression in cryptococcal disease, it is important to study the genetic and phenotypic differences in the context of human infection to identify the human and fungal risk factors that contribute to pathogenesis and poor clinical outcomes. In this review, we summarize the current understanding of the different clinical presentations and health outcomes that are associated with pathogenicity and virulence of cryptococcal strains with respect to specific genotypes and phenotypes.
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