THE TRICHOPHYTON EAE 319 



and interdigital surfaces. It may establish secondary infection in 

 pulmonary tuberculosis and has been recorded to be present in 

 the mouths of normal, healthy persons in the proportion of 3 to 

 24%. 



Monilia psilosis is associated with sprue, a disease primarily of 

 the tropics, which involves the intestinal tract. Prolonged diar- 

 rhoea and anemia are the most outstanding symptoms. Change of 

 climate and vitamin deficiency have also been assigned etiologic 

 roles in sprue, and M. psilosis is now generally believed to be a 

 secondary cause of the disease. 



ASPERGILLUS FUM1GATUS 



Species of Aspergillus are predominantly saprophytes, but 

 Dodge (1935) has assembled published reports showing that ap- 

 proximately 30 species may at times be pathogenic. Aspergillus 

 jumigatiis is among those that are regularly pathogenic. It attacks 

 man, particularly in humid regions, most commonly producing 

 symptoms that clinically resemble those of pulmonary tubercu- 

 losis. If the sputum is examined, conidia will be found, but no 

 trace of Mycobacterium tuberculosis. Neither are tubercles 

 formed in the lungs, and upon treatment with potassium iodide the 

 lung involvement usually clears promptly. 



Aspergillosis may be regarded as an occupational disease for the 

 reason that it is most prevalent among those who work with abra- 

 sives, force-feed fowls, or prepare furs or feathers for use as wear- 

 ing apparel. The same species involves the lungs of birds, espe- 

 cially quails and grouse, and may cause severe epizootics among 

 them. 



Some of the other pathogenic species quite regularly involve the 

 auditory passages or the nails or are associated with abscesses 

 or asthma. 



THE TRICHOPHYTONEAE OR RINGWORM FUNGI 



The Trichophytoneae constitute a group of 100 to 200 species 

 of Fungi Imperfecti that parasitize man and various animals by 

 invading the keratinized layers of the skin and its modifications, 

 such as hair, nails, feathers, hooves, and horns. The resulting 

 dermatomycoses are commonly known as ringworm, tinea, dhobie 



