We developed and assessed the diagnostic value of a novel quantitative nested real-time (QNRT) PCR assay targeting the internal transcribed spacer region of ribosomal DNA (rDNA) in a guinea pig model of invasive pulmonary aspergillosis. Groups of 5 immunosuppressed animals that were infected using an aerosol chamber with Aspergillus fumigatus conidia were humanely terminated 1 h postinoculation and at days 3, 5, 7, and 11 postchallenge, and lung tissue, bronchoalveolar lavage (BAL) fluid, whole blood, and serum samples were collected. The QNRT PCR results obtained with the serum and BAL fluid were compared to those achieved with galactomannan and (1→3)-β-d-glucan assays. High fungal burden levels were detected by QNRT PCR in both lung tissue and BAL fluid in all infected animals at each time point, and the sensitivity of each assay in BAL fluid was 100% by day 3 and remained so through the remainder of the study. The sensitivity of detection of fungi in whole blood and serum samples was significantly lower, and some samples remained negative by all three assays despite the advanced stage of the infection. From these data, we can conclude that this novel QNRT PCR method was highly sensitive for the detection of A. fumigatus from different types of samples in this model. In addition, BAL fluid samples appeared to be the most suitable for the early diagnosis of invasive pulmonary aspergillosis. When testing serum, the use of a combination of available assays may increase the possibility of early detection of this opportunistic mycosis.
- MeSH
- Aspergillus fumigatus izolace a purifikace MeSH
- beta-glukany analýza MeSH
- bronchoalveolární lavážní tekutina mikrobiologie MeSH
- DNA fungální genetika MeSH
- invazivní plicní aspergilóza mikrobiologie patologie MeSH
- kvantitativní polymerázová řetězová reakce metody MeSH
- mannany analýza MeSH
- mezerníky ribozomální DNA genetika MeSH
- modely nemocí na zvířatech MeSH
- morčata MeSH
- mykologie metody MeSH
- plíce mikrobiologie MeSH
- počet mikrobiálních kolonií metody MeSH
- polymerázová řetězová reakce metody MeSH
- senzitivita a specificita MeSH
- zvířata MeSH
- Check Tag
- morčata MeSH
- mužské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- hodnotící studie MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
- srovnávací studie MeSH
