Symptoms in the Horse. 



907 



by a severe inflammation of the liair follicles and by the exuda- 

 tion of a yellowish, gmn-like fluid. 



Herpes frequently develops as herpes tonsurans maculosus 

 (true herpes tonsurans) the clinical picture of which was re- 

 cently described especially by E. Frohner. Circular spots ap- 

 pear chiefly on the upper parts of the body in which the hair 

 looks as though it w^ere closely cropped. Short hair stumps 

 stand out, surrounded by whitish deposits (fungous mantle) and 

 split at the tips ; the surface of the skin in between is covered 

 with scales of variable thickness, which are often glued into 

 crusts (microsporosis of the French authors). The formation 

 of the spots proceeds in such a way that the hair is slightly 

 ruffled up in patches the size of a lentil to a five-cent piece, the 

 skin having a some- 

 what uneven feeling 

 when the h a n cl 

 strokes it gently, be- 

 cause very small, mil- 

 let-sized delicate ves- 

 icles are present, 

 which, however, dry 

 into thin crusts in a 

 day and which on ac- 

 count of the hair coat 

 remain unnoticed on 

 casual inspection. At 

 the same time there is 

 desquamation of soft, 

 greasy, grayish or 

 yellowish "as1)estos 

 like" little scales. In 

 8 to 14 days, and 

 somewhat earlier 

 in Avell groomed 

 animals, the hairs 

 break off near the 

 surface of the skin; 



single hairs, however, fall out whole, and the skin now appears 

 blackish gray for a short time, and somewhat moist, but it is 

 soon covered with thick, profuse scales as described, which unite 

 to form crusts. Meanwhile the- spots grow larger at the periphery 

 and become as large as a dollar piece, not infrequently they 

 coalesce with one another, forming irregular surfaces. As soon 

 as the last named size is reached, further spread ceases, scab 

 formation becomes less and gradually new hairs grow which, 

 however, form a contrast to the remaining hair coat by their dark 

 color. Meanwhile, fresh spots always form round about, so that 

 in some rare cases the whole surface of the body may finally be 

 involved. The hairs at the affected spots often fall out, first 

 at the periphery (Neumann) and in consequence ring formed 



Fig. 131. Scab of herpes of the horse. 



