Pathogenesis 827 



animal by contact and by inoculation. Men, dogs, cats, 

 horses, sheep, goats, and swine all suffer from the infection. 

 The growth of the hypha between the epidermal layers causes 

 a chronic inflammation, with hyperemia, desquamation, the 

 formation of some papules, and occasional pustules. The 

 invasion of the hair-follicles and the growth of the fungi into 

 the hairs cause them to become fragile and break off, as well 

 as to loosen and drop out. 



The name "barber's itch" results from the frequent trans- 

 mission of the infection by the barber's razors. The disease 

 is easily transmissible and precautions should always be 

 taken to prevent its dissemination. 



