Author:

Kaufman L, Standard PG, Jalbert M, Kraft DE.

Date: 3 January 2007

Abstract:

Isolation and identification of pathogenic Aspergillus and Fusarium spp. from clinical materials provide the most accurate means for establishing a diagnosis of infections by these molds. Such efforts, however, are not always successful. Histologic diagnosis also has its limitations. In vivo the hyphae of Aspergillus and Fusarium spp. are very similar and their in situ manifestations are not pathognomonic. To improve the histologic diagnosis of infections by Aspergillus and Fusarium species, we developed polyclonal fluorescent-antibody reagents to Aspergillus fumigatus and Fusarium solani and evaluated their diagnostic utilities. Our studies revealed that A. fumigatus and F. solani share epitopes not only with one another but also with other Aspergillus and Fusarium spp. as well as with Paecilomyces lilacinus and Pseudallescheria boydii. Adsorption of the A. fumigatus conjugate with cells of Fusarium proliferatum and F. solani and F. solani antiserum with cells of Aspergillus flavus resulted in reagents that distinguished Aspergillus spp. from Fusarium spp. but that still cross-stained P. lilacinus and P. boydii. Adjunctive use of a specific P. boydii conjugate enabled the identification of Aspergillus spp., Fusarium spp., P. lilacinus, and P. boydii in formalin-fixed tissue sections from 19 humans with culture-proven cases of mycotic infection.

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