DISEASE IN GENERAL 



215 



live stock owners in the community is necessary if a quarantine 

 is to check the ravages of disease. 



It is essential that a quarantine be continued until all danger 

 of spreading disease is passed. If it is lifted too soon no more 

 benefit follows than if it had not been enforced. 



(6) The Cleaning up of the Premises. — Disinfection is the 

 chief weapon of the sanitarian for making infected premises safe. 



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Fig. 61. — Sketches to show how trenches should be dug to cremate a large ani- 

 mal in the open. 



To be effective the disinfectant must come in actual contact with 

 the material which is to be disinfected. The ideal disinfectant 

 is one which will destroy the germs without injury to the object. 

 Some disinfectants are less poisonous to animals than others. 

 There is no one agent applicable in all cases, therefore the con- 

 ditions must be studied in each case and the most suitable dis- 

 infectant selected. The disinfectants in common use are heat, 

 cold, chemicals, fumigation, and sunlight. 



Heat in the form of fire is the most valuable and reliable means 

 of destroying bacteria. When the object can be destroyed, it is 



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