title: Molecular detection and identification of Aspergillus spp. from clinical samples using real-time PCR.
abstract: The definite and rapid diagnosis of invasive aspergillosis is necessary because of the high mortality caused. The objective of this study was to evaluate a real-time PCR assay to detect Aspergillus spp. in clinical samples, based on the Light Cycler technology. Specificity was assessed by using DNA extracted from pathogenic and non-pathogenic bacteria/fungi from Spanish Collection including: two Aspergillus flavus, four Aspergillus fumigatus, two Aspergillus nidulans, two Aspergillus niger and two Aspergillus terreus isolates. The analytical sensitivity was evaluated with different inocula (10(1)-10(5) conidia ml(-1)), and serially diluted DNA of A. fumigatus. To assess clinical applicability, samples from patients at risk were analysed. Species identification was determined by analysing the melting curves. Reactions using genomic DNA from other species of different genera than Aspergillus were negative (specificity: 100%). Analytical sensitivity was 60 fg using DNA and 5-20 conidia using conidial suspensions. The linear range was from 60 to 6 x 10(7) fg. The Tm ranged from 67.34 to 70.7 degrees C for the different Aspergillus spp. studied. Nine hundred and forty-eight consecutive blood samples from 127 patients were processed. In total, 10 (1%) of 948 samples from blood samples were PCR-positive. The real-time PCR assay provides a high sensitivity and specificity for detection of fungal DNA and rapidly identifies most of clinically relevant Aspergillus species.
authors.affiliation: Servicio de Microbiología Clínica, Hospital Universitario de Valme, Seville, Spain.
authors.forename: Mercedes
authors.initials: M
authors.lastname: Ramírez
authors.forename: Carmen
authors.initials: C
authors.lastname: Castro
authors.forename: José Carlos
authors.initials: JC
authors.lastname: Palomares
authors.forename: M José
authors.initials: MJ
authors.lastname: Torres
authors.forename: Ana Isabel
authors.initials: AI
authors.lastname: Aller
authors.forename: Maite
authors.initials: M
authors.lastname: Ruiz
authors.forename: Javier
authors.initials: J
authors.lastname: Aznar
authors.forename: Estrella
authors.initials: E
authors.lastname: Martín-Mazuelos
mesh_terms: D001228:Aspergillosis / Q000175:diagnosis / Q000382:microbiology; D001230:Aspergillus / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D004271:DNA, Fungal / Q000032:analysis / Q000302:isolation & purification; D016469:Fungemia / Q000175:diagnosis / Q000382:microbiology; D006801:Humans; D016533:Mycological Typing Techniques; D016133:Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D013045:Species Specificity
chemical_list: D004271:DNA, Fungal