484 PARASITIC SKIN DISEASES 



ther spread of the fungus and in addition are soothing and 

 protective to the irritated skin. 



Creolin or iodin ointment is recommended and gives 

 good results. These may be applied once daily for a week 

 followed by a thorough cleansing. Continued treatment 

 depends upon the appearance. Small areas may be treated 

 with pure tincture of iodin, two or three applications a week. 

 A strong solution of bichlorid of mercury (1-500) is also 

 quite efficient. Careful inspection must be made frequently 

 for new disease areas. Powdered aloes will prevent the 

 patient licking off the ointment. 



If other animals are kept near care must be taken to 

 prevent the spread of the disease. All removed hair, crusts, 

 also the bedding used by the patient, should be destroyed. 

 Cleanse the sleeping quarters with a strong solution of 

 bichlorid of mercury. Restrict their range to prevent con- 

 tamination of runways and yards. Cleanse and disinfect 

 all utensils and other articles used about them. 



FAVUS. 



Honeycomb Ring-worm. Comb Disease. White Comb. 



Etiology.— This disease is due to a fungus, the Achorion 

 schoenleinii. It occurs chiefly in cats, mice and rats, but also 

 in dogs and rabbits. The type affecting birds is caused by a 

 special fungus similar to the trichophyton and designated 

 as the Lophophyton gallinarum, commonly called "white 

 comb" or "comb disease." 



Pathology.— The fungus localizes itself in a hair follicle. As 

 it develops it gradually extends over the surrounding skin 

 forming a yellowish crust. Immediately beneath it the skin 

 atrophies, becomes moist and around the edge of the lesion 

 appears an inflammatory swelling producing a cup-shaped 

 depression at the bottom of which the crust is attached. 

 This crust is composed mostly of the fungus material, mixed 

 with hair or epithelial masses. 



Symptoms.— Fa vus usually appears about the head espe- 

 cially in cats but the feet are also commonly affected. This 



