CONTROL OF BACTERIAL DISEASES 245 



BACTERIAL TESTS OF MILK PRODUCED IN KELTON DAIRIES 

 (BACTERIA PER CUBIC CENTIMETER) 



tuberculosis, typhoid, dysentery, diphtheria, tonsillitis, cholera, and the 

 virus of scarlet fever. This does not make the milk any cleaner, nor does 

 it kill the more resistant bacteria, but if it is dangerous, it renders 

 it safe. 



Flies, vermin, house pets as transmitters of contact in- 

 fections. After the human hand come other active germ 

 carriers, and among these the house fly probably stands 

 first not only in transmitting germs of filth and disease to 

 foods but in combining air-carriage with contact. This prob- 

 lem has been treated in a previous chapter. Roaches and rats 

 and mice should be universally recognized as too filthy to 

 eat with, and should be completely exterminated, along with 

 the flies, from every household. Cats, on account of their 

 often intimate contact with children, have been responsible 

 for innumerable infections, especially of diphtheria. Since 

 this germ attacks cats virulently, they assume the double role 

 of irresponsible patients and mechanical carriers in the family. 



1 This dairy, on April 3, had a count of 8,000,000. 



2 This count was made March 30. 



3 Due to Kelton dairymen raising dust by sweeping at milking time. 



