498 
THE VETERINARY SCIENCE 
2. Scab. 
This disease somewhat resembles mange in horses. It i:- 
very serious in some countries, but is not at all common ii 
Canada or United States. 
Causes. — It is a contagious disease, bemg transmitted 
through the germ or parisites. These multiply extremely fast 
and do great injury to the skin, at the same time causing 
severe irritation. There are three classes, namely: 
Scorcoptes, which burrow into the tissues of the skin; 
Dermatodectes, which attach themselves unto the skin — 
those more frequently encountered in this country — and 
Symbiotes, found mostly to attack the feet. 
Fig. 79. — 1. Showing the Effect of Scab. 2. The Scab Parasite — Magnihed. 
Symptoms. — There is extreme irritation as evidenced by 
the continual scratching. The germ may be seen clearly 
with a good microscope and soon spreads until every member 
of a flock becomes infected. The wool soon begins to fall 
out because of the ravages of the germ about the roots and 
the extreme uneasiness soon causes loss of flesh and a gen 
eral debilitated condition. 
Be careful in handling infected sheep, as there is a possi- 
bility that you may yourself become infected. 
Treatment. — Clip the wool off in order to allow free ac- 
cess to the skin for the application of medicine. A very 
cheap and effective remedy is creolin water, made by adding 
two teaspoonfuls of creolin to a pint of rain water. Shake 
well and rub in all over the body with a brush. Do this 
every second day until the disease stops and the wool starts 
