130 DISEASES OF SWINE 



ing and care in order to keep them in a healthy, 

 growing condition. Healthy individuals possess a 

 certain amount of resistance toward disease, and 

 this form of immunity plays no small part in the 

 prevention of hog cholera. However, immunity 

 from this source is limited, and when an animal 

 in the best of health is exposed to a large number 

 of active germs at any one time, disease is pro- 

 duced. This fact shows the importance of clean 

 yards and the relation that other sanitary measures 

 have to good health in the prevention of disease. 

 Hygenic Measures Necessary in the Treatment 

 of Hog Cholera. — It ds very necessary that we 

 recognize the disease in the early stages in order 

 to prevent its spread. In some outbreaks, the 

 symptoms are not typical at the beginnmg of the 

 outbreak and a diagnosis cannot be made from the 

 symptoms alone. When such is the case, a sick 

 hog should be destroyed and a careful post mortem 

 examination made, and if it proves to be cholera, 

 active measures should be taken against its spread- 

 ing. If practical under the conditions, the herd 

 should be divided into small bunches, and the sick 

 animals separated from the well ones. If the pens 

 and hog houses are in such a condition that they 

 cannot be properly cleaned and disinfected, the 

 herd should be moved to some convenient place 

 and temporary quarters built. When the weather 

 is warm, the only protection necessary is shade. 

 In cold weather, the quarters should be warm 

 enough to keep the hogs from piling up and catch- 



