Abstract
Sporotrichosis is a subacute to chronic fungal infection of skin and subcutaneous tissues. The causative agent, Sporothrix schenckii, is a dimorphic fungus that exists as a mold in the environment and as a yeast in tissues. S. schenckii is not a single species, but rather a complex of at least 6 phylogenetically different organisms. In the environment, S. schenckii is found in sphagnum moss, decaying wood, vegetation, hay, and soil. Infection occurs when a person is exposed to an environmental source, and the organism is inoculated through the skin. A large continuing outbreak in Rio de Janeiro is associated with zoonotic transmission from infected cats.
The most common manifestation of sporotrichosis is lymphocutaneous or localized cutaneous infection. Pulmonary sporotrichosis mimics reactivation tuberculosis and occurs most often in those who have chronic obstructive pulmonary disease. Osteoarticular sporotrichosis is uncommon and is found most often in middle-aged men. Disseminated and meningeal sporotrichosis are very uncommon; almost all patients have cellular immune deficiencies, and most cases are in persons with AIDS. Most patients who have sporotrichosis can be successfully treated with oral itraconazole although saturated solution of potassium iodide (SSKI) is still used in some countries. Those patients who have disseminated infection, meningitis, or severe pulmonary involvement should be treated initially with an intravenous amphotericin B formulation before transitioning to itraconazole.
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Further Reading
Barros MB, de Almeida-Paes R, Schubach AO. Sporothrix schenckii and sporotrichosis. Clin Microbiol Rev. 2011;24:633–54.
Pappas PG. Sporotrichosis. In: Kauffman CA, Pappas PG, Sobel JD, Dismukes WE, editors. Essentials of medical mycology. 2nd ed. New York: Springer; 2011. p. 387–98.
Queiroz-Telles F, Buccheri R, Benard G. Sporotrichosis in immunocompromised hosts. J Fungi. 2019;5:8. https://doi.org/10.3390/jof5010009.
Rossow JA, Queiroz-Telles F, Caceres DH, et al. A one health approach to combatting Sporothrix brasiliensis: narrative review of an emerging zoonotic fungal pathogen in South America. J Fungi. 2020;6:247. https://doi.org/10.3390/jof6040247.
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Kauffman, C.A., Miceli, M.H. (2023). Sporotrichosis. In: Hospenthal, D.R., Rinaldi, M.G., Walsh, T.J. (eds) Diagnosis and Treatment of Fungal Infections. Springer, Cham. https://doi.org/10.1007/978-3-031-35803-6_22
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