THE MOST COMMON DISEASES OF SWIXE 543 



rather than sudden, as is the case in cholera; hkewise 

 the progress is very slow, and the symptoms are those 

 of general unthriftiness rather than of acute illness. 

 7\iberculosis does not show a tendency to spread rap- 

 idly, as is the case in cholera, and the deaths, if any 

 occur, will in the vast majority of cases follow a pro- 

 longed illness. 



ANTHRAX 



"Hogs are rarely affected by anthrax, but when this 

 does occur it might be readily mistaken for acute chol- 

 era. The distinguishing features of anthrax are marked 

 swelling of the throat and tongue, with frequently a 

 bloody froth in the mouth, and further by the fact that 

 anthrax in hogs usually follows disease in other animals 

 on the farm, horses, cattle, and sheep being more sus- 

 ceptible to anthrax than hogs. 



LUNG WORMS 



"Young, growing pigs are at times attacked by lung 

 worms, which bring about an inflammation of the air 

 passages. The most important symptoms are general 

 unthriftiness, and a hard cough. Old hogs are rarely 

 attacked and the younger hogs usually recover. The 

 worms are very small (one-half to one inch in length), 

 and examination of the frothy expectoration of sick 

 hogs or of the lungs after death is usually required to 

 make a positive diagnosis. In this disease there is an 

 entire absence of symptoms of acute illness such as 

 usually accompany an attack of cholera. 



