CHAPTER XXXII 



PATHOGENIC FUNGI, MOLDS AND YEASTS— THE GENERA 

 BLASTOMYCES, ASPERGILLUS, SPOROTRICHUM, TRI- 

 CHOPHYTON, MICROSPORUM, AGHORION, OIDIUM. 



A CONSIDERABLE number of molds and a few yeasts are 

 known which are capable of producing disease in man 

 or animals. For the most part these are not common but 

 are deserving of brief mention. 



Pathogenic Yeasts 



The Genus Blastomyces. — Blastomyces is a generic name 

 given to those yeasts capable of producing disease. Two 

 species have been described. One from Europe and the 

 United States, one from Europe and Japan, the latter, 

 Blastomyces farciminosus, causing a disease of the horse 

 closely resembling farcy, the former, Blastomyces derma- 

 titidis, causing disease in man. It is probable still another 

 disease of man, termed coccidioidal granuloma caused by a 

 Blastomyces has been recorded in the United States and 

 South America. These diseases are comparatively rare and 

 are interesting in this connection largely because they illus- 

 trate the possibility of yeastlike organisms producing dis- 

 ease. 



Pathogenic Molds 



Genus Aspergillus. — Many species of the genus Asper- 

 gillus have at one time or another been reported as as- 

 sociated with disease in animals. One species only has 

 been commonly isolated from such infections, the Asper- 

 gillus fumigatus, causing the so-called aspergillosis of birds 

 and pneumomycosis in man and many different species of 



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