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Maphanga, Tsidiso G; Birkhead, Monica; Muñoz, José F; Allam, Mushal; Zulu, Thokozile G; Cuomo, Christina A; Schwartz, Ilan S; Ismail, Arshad; Naicker, Serisha D; Mpembe, Ruth S; Corcoran, Craig; de Hoog, Sybren; Kenyon, Chris; Borman, Andrew M; Frean, John A; Govender, Nelesh P
Journal of clinical microbiology, 02/2020, Letnik: 58, Številka: 3Journal Article
We reevaluated 20 cases of blastomycosis diagnosed in South Africa between 1967 and 2014, with considered to be the etiological agent, in light of newly described species and the use of more advanced technologies. In addition to histopathological and/or culture-based methods, all 20 isolates were phenotypically and genotypically characterized, including multilocus typing of five genes and whole-genome sequencing. Antifungal susceptibility testing was performed as outlined by Clinical and Laboratory Standards Institute documents M27-A3 and M38-A2. We merged laboratory and corresponding clinical case data, where available. Morphological characteristics and phylogenetic analyses of five-gene and whole-genome sequences revealed two groups, both of which were closely related to but distinct from , , and The first group ( = 12) corresponded to the recently described species , and the other ( = 8) is described here as sp. nov. Both species exhibited incomplete conversion to the yeast phase at 37°C and were heterothallic for mating types. All eight isolates belonged to the α mating type. Whole-genome sequencing confirmed distinct species identities as well as the absence of a full orthologue of the gene. Extrapulmonary (skin or bone) disease, probably resulting from hematogenous spread from a primary lung infection, was more common than pulmonary disease alone. Voriconazole, posaconazole, itraconazole, amphotericin B, and micafungin had the most potent activity. Over the 5 decades, South African cases of blastomycosis were caused by species that are distinct from Increasing clinical awareness and access to simple rapid diagnostics may improve the diagnosis of blastomycosis in resource-limited countries.
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