PARASITES AND PARASITIC DISEASES OF HORSES 



19 



usually embedded in the lining of the intestine and doubtless produce 

 considerable irritation. The fact that the infective larvae are capable 

 of penetrating the skin adds another complication and it is probable 

 that foals acquire part of their infestation while lying down on pas- 



Figure 11. — Type of sanitary box stall. Note feed box and hayrack raised above 



the ground. 



tures and in their stalls. As the larvae penetrate the skin it becomes 

 reddened and obscure skin troubles in horses may be caused by the 

 penetration of these worms. The larval worms may carry pathogenic 

 bacteria into and through the skin. 



Treatment. — Nothing is known concerning effective treatment for 

 these threadworms. In severe cases of diarrhea, in foals, caused by 

 this parasite, carbon tetrachloride is worthy of trial. The drug may 

 be used for foals at a dose rate of 0.1 cubic centimeters per kilogram 



