SECTION XVII— PART 2 
MYCOSIS 
This is a general term applied to the infections with 
Hyphomycetes, but in the zoological material discussed 
here it refers chiefly to the growth of aspergillus in the 
air sacs and viscera of birds. A few cases of cutaneous 
mould growth have been seen in mammals but are of 
trifling importance ; brief mention will be made of them 
on a later page. 
Under the names of Aspergillosis and brooder pneu- 
monia, the infection with Aspergillus fumigatus, A. glau- 
cus and others is w^ell kno^^^l to breeders of chickens, 
ducks and ostriches. Literary references to its occurrence 
in zoological collections are numerous, but there seems to 
be no record indicative of its frequency in the various 
orders nor discussion of the pathological types best 
exhibited by different birds. There has indeed been 
some discussion of the actual entity, mould disease, the 
picture found at autopsy being referred to secondary con- 
tamination with fungi in the presence of bacterial infec- 
tion. Experiments by DeLong and others have been 
indifferently successful in the production of the disease 
by inlialation of mould spores. The appearance of groups 
of cases in breeding places, apparently all exhibiting the 
same organism, in the absence of other varieties of avian 
epizootics seems to warrant the conclusion that the 
hyphomycetes can at least be associated mtli a fatal 
morbid lesion of quite uniform character whether or not 
they be the original invaders. 
Judging by our experience it would seem probable that 
the aspergillus can, under conditions not fully explained, 
cause inflammation of the a\dan air sac and tubercles in 
viscera, in the absence of other evident causes of illness 
and death. Over three-fourths of our cases have no other 
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