THE PATHOGENIC FUNGI 1003 



produces transitory ringworm like lesions. With some culture strains 

 similar results have been obtained with others inoculation has been 

 unsuccessful. 



Other Species of Achoria. Fungi have also been cultivated from 

 favus-like lesions in animals. The Achorion Quinckeanum which 

 frequently infects house mice has occasionally been found in human 

 cases of favus of the body. In culture these so-called achoria show 

 little in common with Schoenlein's parasite but resemble somewhat 

 trichophyta of the gypseum group (V. infra). Plant concludes that 

 there is no reason for placing them in this genus except that they 

 form scutula in lesions. 



RINGWORM OR TINEA 



The common form of this disease is tinea of the scalp which 

 affects only children. It is highly contagious and in children's 

 schools and institutions may assume epidemic proportions. The 

 infection begins in the epidermis where it is often transitory but 

 the parasite soon invades the hairs and there remains. 



There is usually slight evidence of inflammation but some species 

 of the ringworm fungi cause suppuration in and about the hair 

 follicle. This may result in the formation of large indolent subcu- 

 taneous abscesses known as kerions. 



Tinea of the body may occur secondarily to scalp lesions in 

 children or as a primary infection at any period of life. The lesions 

 often assume a circular form the disease progressing at the per- 

 iphery and clearing at the center. There may be only slight thicken- 

 ing and desquamation of the epidermis but usually there are super- 

 ficial vesicles which quickly dry into crusts, and occasionally 

 follicular pustules and kerions. Some species invade the nails. 



Ringworm is also a common disease in domestic animals and 

 human cases can often be traced to infection from these sources. 

 The fungi of animal origin when they infect man either directly 

 from a diseased animal or indirectly from another human case, 

 usually produce more inflammatory lesions than do those species 

 which affect man only. 



MICROSPORON 



The small sporod ringworm fungi are in this locality the com- 

 monest cause of ringworm of the scalp. The species of animal 



