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Fungi that Infect Humans

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  • Authors: Julia R. Köhler1, Bernhard Hube2, Rosana Puccia3, Arturo Casadevall4, John R. Perfect5
  • Editors: Joseph Heitman6, Barbara J. Howlett7
    Affiliations: 1: Division of Infectious Disease, Boston Children’s Hospital, Boston, MA 02115; 2: Department of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knoell Institute Jena (HKI), Jena, Germany; 3: Disciplina de Biologia Celular, Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina-Universidade Federal de São Paulo, São Paulo, Brazil; 4: Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205; 5: Division of Infectious Diseases, Duke University Medical Center, Durham, NC 27710; 6: Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710; 7: School of Biosciences, The University of Melbourne, Victoria, NSW 3010, Australia
  • Source: microbiolspec June 2017 vol. 5 no. 3 doi:10.1128/microbiolspec.FUNK-0014-2016
  • Received 01 June 2016 Accepted 02 March 2017 Published 09 June 2017
  • Julia R. Köhler, [email protected]
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  • Abstract:

    Fungi must meet four criteria to infect humans: growth at human body temperatures, circumvention or penetration of surface barriers, lysis and absorption of tissue, and resistance to immune defenses, including elevated body temperatures. Morphogenesis between small round, detachable cells and long, connected cells is the mechanism by which fungi solve problems of locomotion around or through host barriers. Secretion of lytic enzymes, and uptake systems for the released nutrients, are necessary if a fungus is to nutritionally utilize human tissue. Last, the potent human immune system evolved in the interaction with potential fungal pathogens, so few fungi meet all four conditions for a healthy human host. Paradoxically, the advances of modern medicine have made millions of people newly susceptible to fungal infections by disrupting immune defenses. This article explores how different members of four fungal phyla use different strategies to fulfill the four criteria to infect humans: the Entomophthorales, the Mucorales, the Ascomycota, and the Basidiomycota. Unique traits confer human pathogenic potential on various important members of these phyla: pathogenic Onygenales comprising thermal dimorphs such as and ; the spp. that infect immunocompromised as well as healthy humans; and important pathogens of immunocompromised patients—, , and spp. Also discussed are agents of neglected tropical diseases important in global health such as mycetoma and paracoccidiomycosis and common pathogens rarely implicated in serious illness such as dermatophytes. Commensalism is considered, as well as parasitism, in shaping genomes and physiological systems of hosts and fungi during evolution.

  • Citation: Köhler J, Hube B, Puccia R, Casadevall A, Perfect J. 2017. Fungi that Infect Humans. Microbiol Spectrum 5(3):FUNK-0014-2016. doi:10.1128/microbiolspec.FUNK-0014-2016.


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Fungi must meet four criteria to infect humans: growth at human body temperatures, circumvention or penetration of surface barriers, lysis and absorption of tissue, and resistance to immune defenses, including elevated body temperatures. Morphogenesis between small round, detachable cells and long, connected cells is the mechanism by which fungi solve problems of locomotion around or through host barriers. Secretion of lytic enzymes, and uptake systems for the released nutrients, are necessary if a fungus is to nutritionally utilize human tissue. Last, the potent human immune system evolved in the interaction with potential fungal pathogens, so few fungi meet all four conditions for a healthy human host. Paradoxically, the advances of modern medicine have made millions of people newly susceptible to fungal infections by disrupting immune defenses. This article explores how different members of four fungal phyla use different strategies to fulfill the four criteria to infect humans: the Entomophthorales, the Mucorales, the Ascomycota, and the Basidiomycota. Unique traits confer human pathogenic potential on various important members of these phyla: pathogenic Onygenales comprising thermal dimorphs such as and ; the spp. that infect immunocompromised as well as healthy humans; and important pathogens of immunocompromised patients—, , and spp. Also discussed are agents of neglected tropical diseases important in global health such as mycetoma and paracoccidiomycosis and common pathogens rarely implicated in serious illness such as dermatophytes. Commensalism is considered, as well as parasitism, in shaping genomes and physiological systems of hosts and fungi during evolution.

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Clusters of cells in brochoalveolar lavage fluid of an 8-year-old boy, post-lung transplant. Gomori methenamine silver (GMS) stain. Scale bar, 20 μm. Chest film of a 17-year-old boy living with HIV, with pneumonia due to . Biopsy of skin nodule of a 9-year-old boy with aplastic anemia, containing numerous yeasts. GMS stain. Posterior-anterior chest film (D) and axial computed tomography scan (E) of a 16-year-old previously healthy girl with cavitating cryptococcal pneumonia. sp. hyphae in bowel wall of an adolescent boy, post-liver transplant. GMS stain. Scale bar, 20 μm. in maxillary sinusitis and osteomyelitis of a young man, post-intestinal transplant. In the human host, aspergilli produce conidiophores (prominently visible in the image on the right) only in air-filled spaces. GMS stain. Scale bars, 20 μm. in bronchoalveolar lavage fluid of a 3-week-old neonate with adenosine deaminase deficiency. Scale bar, 20 μm. (All micrographs: Dr. Harry P. W. Kozakewich, Department of Pathology, Boston Children’s Hospital; Radiographs: Department of Radiology, Boston Children’s Hospital.)

Source: microbiolspec June 2017 vol. 5 no. 3 doi:10.1128/microbiolspec.FUNK-0014-2016
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