Abstract:
:Cryptococcus neoformans and Cryptococcus gattii are the main pathogenic species of invasive cryptococcosis among the Cryptococcus species. Taxonomic studies have shown that these two taxa have different genotypes or molecular types with biological and ecoepidemiological peculiarities. Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has been proposed as an alternative method for labor-intensive methods for C. neoformans and C. gattii genotype differentiation. However, Vitek MS, one of the commercial MALDI-TOF MS instruments, has not been yet been evaluated for this purpose. Thus, we constructed an in-house database with reference strains belonging to the different C. neoformans (VNI, VNII, VNIII, and VNIV) and C. gattii (VGI, VGII, VGIII, and VGIV) major molecular types by using the software Saramis Premium (bioMérieux, Marcy-l'Etoile, France). Then, this new database was evaluated for discrimination of the different genotypes. Our in-house database provided correct identification for all C. neoformans and C. gattii genotypes; however, due to the intergenotypic mass spectral similarities, a careful postanalytic evaluation is necessary to provide correct genotype identification.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
Siqueira LPM,Gimenes VMF,de Freitas RS,Melhem MSC,Bonfietti LX,da Silva AR Jr,Souza Santos LB,Motta AL,Rossi F,Benard G,de Almeida JN Jrdoi
10.1128/JCM.01282-18subject
Has Abstractpub_date
2019-01-02 00:00:00issue
1eissn
0095-1137issn
1098-660Xpii
JCM.01282-18journal_volume
57pub_type
杂志文章abstract::We compared examination of unstained and Gram-stained smears as methods of evaluating sputum quality. Of 100 slides examined, 96 (96%) were graded identically. Each discrepancy between methods was near the cutoff for specimen acceptability. We concluded that examination of unstained smears can provide an accurate, cos...
journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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pub_type: 杂志文章,多中心研究
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journal_title:Journal of clinical microbiology
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