Pyrolysis mass spectrometry (PYMS) is a useful typing method for many
bacterial and Candida species. We attempted to type Aspergillus spp. b
y PYMS. Four distinct A. fumigatus isolates could not be distinguished
from each other, whereas one A. niger and one A. terreus could. Poor
reproducibility was shown using multiple identical cultures of a singl
e A. fumigatus isolate and several isolates of the same DNA type. PYMS
is obviously an unsuitable typing method for Aspergillus spp.