292 INFECTIOUS DISEASES 



method of disposing of dairy cows tliat react to the tiTberculin 

 test is to slaughter them. Unless a large percentage of the 

 herd is ti;bercular, it is not advisable to practise segregation 

 and quarantine. This may be advisable if the reactor is a 

 valuable breeding animal, unless visible symptoms are shown. 

 The milk from reacting cows may be used if it is boiled or steril- 

 ized. Whenever a calf is born of a reactor, it should be separated 

 from the mother and fed milk from a healthy cow. 



The separation of the tubercular from the healthy cows must 

 be complete. Sej)arate buildings, yards and pastures that do not 

 join the quarters where the healthy animals are kept should be 

 provided. The person attending the reactors should not attend 

 the healthy animals, and separate forks, shovels, pails and other 

 utensils should be provided for the two herds. 



* The best method of controlling tuberculosis in hogs is to 

 slaughter all reactors, disinfect yards and liouses and move the 

 herd. If the old quarters are free from filth and carefully disin- 

 fected, the hogs may be returned without danger of infection 

 after six months. A retest of the herd should be made before 

 returning them to the permanent quarters and the reactors 

 slaughtered. 



In the principal stock raising states accredited or tubercular- 

 free breeding herds are becoming common. This has been made 

 possible by large federal appropriations of funds for the eradica- 

 tion of tuberculosis. This is the most effective method that 

 has been used in the eradication of this disease. 



QUESTIONS 



1. Give tlie history of the early experimental work in tubereiilosis ; give the 



common mctliods of spreading the disease. 



2. What are the symptoms and post-mortem lesions in tuberculosis? 



3. Give the method of controlling tuberculosis. 



