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Comparative Study
. 2019 May 14;19(1):96.
doi: 10.1186/s12866-019-1467-x.

Application of fungal fluorescent staining in oral candidiasis: diagnostic analysis of 228 specimens

Affiliations
Comparative Study

Application of fungal fluorescent staining in oral candidiasis: diagnostic analysis of 228 specimens

Yilin Yao et al. BMC Microbiol. .

Abstract

Background: Several conventional methods, including fungal culture and periodic acid-Schiff (PAS) reagent staining, have been used to diagnose oral candidiasis. The aim of this study was to evaluate the efficacy of a novel method, fungal fluorescent staining, in relation to conventional protocols in the diagnosis of oral candidiasis.

Methods: We collected 106 oral swabs and 122 oral biopsy tissues from patients highly suspected with oral candidiasis. We applied fungal culture and periodic acid-Schiff reagent staining as the gold standard diagnostic tools. The efficacy of these methods in determining the presence of Candida was compared with that of fluorescent staining.

Results: In the majority of specimens subjected to fluorescent staining, fungal organisms were distinguished by blue fluorescence surrounding their tubular or annular shapes. The sensitivity, specificity, Youden index, positive predictive value and negative predictive value of the fluorescent staining method were 82.7, 93.5, 76.7, 96.8 and 69.1% in oral swabs and 90.0, 92.9, 82.9, 96.0 and 82.9% in oral biopsy tissues, respectively.

Conclusions: Fungal fluorescent staining represents a rapid method for detection of Candida, supporting its potential utility as an effective early diagnostic tool for oral candidiasis.

Keywords: Fungal culture; Fungal fluorescent staining; Oral candidiasis; Periodic acid-Schiff reagent staining.

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Conflict of interest statement

Ethics approval and consent to participate

This study was approved by Institutional Ethical Committee, Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine (SH9H-2019-T35-1). Written informed consent was obtained from each participant after the investigator had explained the nature of the study.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
a Clinical manifestation of highly suspected oral candidiasis. b Presence of Candida colonies in the culture-positive case. c Fungal hyphae surrounded by strong blue fluorescence under fluorescence microscopy (× 40)
Fig. 2
Fig. 2
a A case of highly suspected oral candidiasis via HE staining under light microscopy (× 40). b Fungal organism (white arrows) on PAS of same specimen (×40). c Fungal organisms from the same section as B distinguishable via fluorescence microscopy as tubular or tubulo-annular structures (white arrows) with a thin rim of bright blue fluorescence (× 40)

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