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Journal of Clinical Microbiology, Oct 1996, 2464-2468, Vol 34, No. 10
Y Yamakami, A Hashimoto, I Tokimatsu and M Nasu
We investigated the possible presence of DNA specific for Aspergillus
species in serum samples of patients with invasive aspergillosis (IA) by
the nested PCR method. Fourteen strains of fungi including 5 strains of
Aspergillus species and 10 strains of common bacteria were used for
examination of specificity and sensitivity of the nested PCR. Two sets of
oligonucleotide primers were derived from the sequence of the variable
regions V7 to V9 of the 18S rRNA genes of Aspergillus fumigatus. The
specific fragment was amplified from five strains of Aspergillus species in
the single and nested PCR but not from other microorganisms. Target DNA was
detected by the nested PCR with as little as 50 fg of the extracted DNA of
A. fumigatus. We investigated the detection of DNA specific for Aspergillus
species in serum samples of a murine model of aspergillosis and 20 patients
with IA. The specific fragment was detected by the nested PCR in 71% of
serum samples of infected mice and 70% of serum samples of patients with
IA, while galactomannan antigen was detected in 43 and 60% of samples,
respectively. The high sensitivity and specificity of the nested PCR
indicate that the assay can provide early diagnosis with sufficient
accuracy to be clinically useful for immunocompromised patients with IA.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
PCR detection of DNA specific for Aspergillus species in serum of patients with invasive aspergillosis
Second Department of Internal Medicine, Oita Medical University, Japan.
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