SUMMARY: Some interactions of Aspergillus species with and , all of which are concerned in otitis externa, are described. The pigments pyocyanine, 1-hydroxyphenazine and the fluorescent green pigments produced by inhibited the germination of spores of the most toxic of these pigments was 1-hydroxyphenazine. did not produce fluorescent pigments in Czapek-Dox medium unless the ferrous sulphate was omitted and asparagine added. Following incubation of the Aspergillus species in this medium, however, grew and produced fluorescent pigment therein. produced antifungal toxic material which was capable of diffusing through cellophan and causing distortion of hyphae.


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