74 BOVINE TUBERCULOSIS AND OTHER CATTLE DISEASES. 



test. The suggestion has been made by a Milk Conference 

 appointed by the Commissioners of the District of Columbia 

 (40). The members of the conference represented the various 

 Federal departments interested in the subject, together with the 

 dairymen. The conference recommends the classification of 

 milk into three grades, as follows : 

 Class 1 . Certified m ilk . ' ' 



This grade represents the highest class of milk, ordinarily 

 certified by medical societies. The tuberculin test and a bac- 

 terial count of under 10,000 per cc., are among the require- 

 ments. (See Chap. IX.) 



' ' Class 2. Inspected milk. ' ' 



This is a lower grade of milk, produced from tested cows, 

 and differing from the former, chiefly, in that the conditions 

 under which the milk is produced need not be equal to those 

 of dairies in Class 1. The bacterial count shall not be more 

 than 100,000 per cc. 



" Class 3. Pasteurized milk. Milk from dairies not able to comply 

 with the requirements specified for the prochiction of milk of classes 1 

 and 2 is to be pasteurized before being sold, and must be sold under the 

 designation 'pasteurized milk 1 . Milk for pasteurization shall be kept at 

 all times at a temperature not exceeding 60F. while in transit from the 

 dairy farm to the pasteurization plant, and milk after pasteurization shall 

 be placed in sterilized retainers and delivered to the consumer at a tem- 

 perature not exceeding 50F. All milk of an unknow r n origin shall be 

 placed in class 3 and subjected to clarification and pasteurization. No 

 cow in any way unfit for the production of milk for use by man, as deter- 

 mined upon physical examination by an authorized veterinarian, and no 

 cow suffering from a communicable disease, except as specified below, 

 shall be permitted to remain on an}- dairy farm on w T hich milk of class 3 

 is produced, except that cows \vhich upon physical examination do not 

 show physical signs of tuberculosis may be included in dairy herds sup- 

 plying milk of this class, although they may have reacted to the tuber- 

 culin test. 



' ' This milk is to be clarified and pasteurized at central pasteurization 

 plants, which shall be under the personal supervision of an officer or 

 officers of the health department. These pasteurization plants may be 

 provided either by private enterprise or by the District Government, and 

 shall be located within the city of Washington." 



Elsewhere in the report, the conference makes the following 

 recommendations regarding tuberculosis : 



