THE PRESENCE or absence of multichambered, spindle-shaped macroconidia or fuseaux has been considered one the foremost characteristic features aiding in the differentiation of the zoophilic and anthropophilic species of the genus Microsporum. There are, however, observations on record which tend to show that presence or absence of these structures under certain circumstances does not constitute the final basis for judgment. Benedek1 found that Microsporum audouini formed fuseaux in the presence of a certain bacillus which he described and classified as Bacillus weidmaniensis. Hazen2 saw increase in fuseaux production in M. audouini on the addition of yeast extract to the medium. Loewenthal3 described a strain of Microsporum canis which lacked spindles in the primary colony and in some of its descendants, and he raised the question of whether or not there existed a relation between the species closer than had been generally accepted. The belief was expressed that
LOEWENTHAL K. EFFECT OF ROENTGEN RAYS ON MICROSPORUM CANIS: An in Vitro Study. AMA Arch Derm Syphilol. 1951;63(6):750–758. doi:10.1001/archderm.1951.01570060078007
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