500 SWINE IN AMERICA 



probably prove effectual and would not be harmful to 

 the animal." 



DISINFECTIXG INFECTED PREMISES 



Dr. W. B. Niles says : "It is a well-known fact that 

 yards or other inclosures in which hogs have died of 

 cholera, remain, for a time at least, infective, and will 

 communicate the disease to susceptible swine placed 

 therein. Consequently if new animals are brought on 

 the farm, new yards must be provided for them, or the 

 old yards, sheds, etc., must be made safe by a thorough 

 disinfection. Owing to the difficulty attending thorough 

 disinfection, and the impossibility of determining when 

 the premises are rid of all cholera germs, it is always 

 advisable to provide new quarters, if possible, when re- 

 stocking the farm. In doing this, however, the mis- 

 take must not be made of using the same troughs, 

 buckets, etc., for the new animals. 



"It often occurs, however, that new yards cannot be 

 provided, and the old premises must be used if new 

 animals are introduced. The length of time necessary 

 for the natural disinfection of the place — that is, for 

 the destruction of the virus by means of sun, air, etc.— 

 is not definitely known, and no doubt varies, depending 

 upon the season and condition of the yards. The writer 

 has noted several instances where the virus seemed to 

 have retained its infective nature over winter, and, on 

 the other hand, has seen yards refilled the same summer 

 without a recurrence of the disease. 



"Having satisfactorily disposed of the dead animals, 

 it is necessary to destroy all troughs used by the dis- 



