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Journal of Clinical Microbiology, 05 1995, 1164-1168, Vol 33, No. 5
S Bretagne, JM Costa, A Marmorat-Khuong, F Poron, C Cordonnier, M Vidaud and J Fleury-Feith
A competitive PCR assay involving the use of bronchoalveolar lavage (BAL)
samples for the diagnosis of invasive pulmonary aspergillosis (IPA) was
developed. For this purpose, a 1-kb mitochondrial DNA fragment of
Aspergillus fumigatus was sequenced. The primers used allowed amplification
of A. fumigatus, A. flavus, A. terreus, and A. niger DNAs but not DNAs of
other fungi and yeasts. BAL samples from 55 consecutively enrolled patients
were tested. Three samples were excluded because of failure of correct
amplification of the internal competitive control. Of 28 immunocompromised
patients, 6 were PCR positive; 3 died of IPA and their BAL cultures yielded
A. fumigatus; and 3 were culture negative and did not develop IPA. Of 15
human immunodeficiency virus-positive patients and 9 immunocompetent
patients, 5 and 4, respectively, were both PCR positive and culture
negative, and none developed aspergillosis. Thus, PCR confirmed IPA in
three patients but gave positive results for 25% (12 of 49) of the patients
who did not develop aspergillosis. The predictive value of PCR- positive
results seems low for patients at risk for aspergillosis. Moreover, the
risk of contamination of reaction buffers or biological samples with
Aspergillus conidia seems high and has to be weighed in regard to the
potential diagnostic benefit of PCR testing as a routine procedure.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Detection of Aspergillus species DNA in bronchoalveolar lavage samples by competitive PCR
Laboratoire de Parasitologie-Mycologie, Hopital Henri Mondor, Creteil, France.
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