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Susceptibility characterization of Scytalidium sp. clinical isolates to antifungi

Grant number: 12/23920-5
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2013
Effective date (End): February 28, 2015
Field of knowledge:Biological Sciences - Microbiology - Biology and Physiology of Microorganisms
Principal researcher:Marcia Regina von Zeska Kress
Grantee:Natalia Silva Morosini
Home Institution: Faculdade de Ciências Farmacêuticas de Ribeirão Preto (FCFRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


The filamentous fungus Scytalidium sp. is a saprophytic and phytopathogenic microorganisms found in soil and vegetation of tropical and subtropical climate. Scytalidium sp. is among of the main non-dermatophytic filamentous agents causing the disease, together with the genera Scopulariopsis, Fusarium, Aspergillus and Onychocola. Species of Scytalidium sp. has been associated with nail primary pathogenesis, which the prevalence of infections has increased in recent decades, although few cases have been reported. There are reports of superficial and deep infections caused by the genus Scytalidium in immunocompetent and immunocompromised patients, including the central nervous system abscess, endophthalmitis, sinusitis, osteomyelitis, fungemia, subcutaneous infections, mycetoma, lymphangitis, lymphadenitis, tinea pedis, onychomycosis, among others. The Scytalidium dimidiatum has been associated with deep infections comparing with its hyaline variant, S. hyalinum. The hyaline variant preferably is involved in infections of skin and nail suggesting that the strain deficient in melanin may be less virulent than the pigmented. Few data are described in the literature about the sensitivity to antifungal drugs for Scytalidium dimidiatum and Scytalidium hyalinum. Due to increased Scytalidium sp. resistance to some antifungal drugs compared to dermatophytes, the differential diagnosis is essential for successful treatment. Thus, the aim of this study is the investigation of factors that could justify the difference in antifungal drugs resistance and pathogenicity (tolerance to different pH, temperatures and differential expression of proteins).(AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TONANI, LUDMILLA; MOROSINI, NATALIA SILVA; DE MENEZES, HENRIQUE DANTAS; NADALETTO BONIFACIO DA SILVA, MARIA EMILIA; WAINWRIGHT, MARK; LEITE BRAGA, GILBERTO UBIDA; VON ZESKA KRESS, MARCIA REGINA. In vitro susceptibilities of Neoscytalidium spp. sequence types to antifungal agents and antimicrobial photodynamic treatment with phenothiazinium photosensitizers. FUNGAL BIOLOGY, v. 122, n. 6, SI, p. 436-448, JUN 2018. Web of Science Citations: 4.

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