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J Clin Microbiol. 1993 March; 31(3): 615-621

Detection of Aspergillus fumigatus by polymerase chain reaction.

C Spreadbury, D Holden, A Aufauvre-Brown, B Bainbridge and J Cohen

Department of Infectious Diseases and Bacteriology, Royal Postgraduate Medical School, Hammersmith Hospital, United Kingdom.

ABSTRACT

Aspergillus fumigatus is an opportunistic nosocomial pathogen causing an often fatal pneumonia, invasive aspergillosis (IA), in immunosuppressed patients. Oligonucleotide primers were used to amplify a 401-bp fragment spanning the 26S/intergenic spacer region of the rDNA complex of A. fumigatus by the polymerase chain reaction (PCR). The primers were highly sensitive and specific: as little as 1 pg of A. fumigatus genomic DNA could be detected, and the primers only amplified DNA from A. fumigatus and not any other fungal, bacterial, viral, or human DNA tested. Using the PCR, we were able to detect A. fumigatus DNA in lung homogenates from immunosuppressed mice experimentally infected with A. fumigatus but not from immunosuppressed uninfected controls. There was 93% correlation between the culture results and the PCR results. In a retrospective clinical study, the sensitivity of the PCR for the detection of A. fumigatus in clinical samples was confirmed by positive amplification in three of three culture-positive respiratory samples from confirmed cases of IA. Because isolation of Aspergillus spp. may reflect contamination and colonization without infection, the feasibility of using the PCR was evaluated by analyzing culture-negative samples from both immunosuppressed patients at high risk for IA and immunocompetent patients with other lung infections. Only 2 of 10 patients were culture negative and PCR positive in the high-risk group, and 2 of 7 patients were culture negative and PCR positive in the immunocompetent group. The results indicate that PCR detection might be a valuable adjunct to current laboratory methods to diagnose IA.

J Clin Microbiol. 1993 March; 31(3): 615-621




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