248 ESSENTIALS OF BACTERIOLOGY 



cubic centimeter. All milk of this class shall be pasteurized 

 under official supervision, and the bacteria count shall not 

 exceed 50,000 per cubic centimeter when delivered to the 

 consumer. 



It' is recommended that dairies producing grade B milk 

 should be scored and that the health departments or the 

 controlling departments, whatever they may be, strive to 

 bring these scores up as rapidly as possible. 



GRADE C. Milk of this class shall come from cows free 

 from disease as determined by physical examinations and 

 shall include all milk that is produced under conditions such 

 that the bacteria count is in excess of 1,000,000 per cubic 

 centimeter. 



All milk of this class shall be pasteurized, or heated to a 

 higher temperature, and shall contain less than 50,000 bac- 

 teria per cubic centimeter when delivered to the customer. 

 It is recommended that this milk be used for cooking or manu- 

 facturing purposes only. 



Whenever any large city or community finds it necessary, 

 on account of the length of haul or other peculiar conditions, 

 to allow the sale of grade C milk, its sale shall be surrounded 

 by safeguards such as to insure the restriction of its use to 

 cooking and manufacturing purposes. 



Classification of Cream. Cream should be classified 

 in the same grades as milk, in accordance with the require- 

 ments for the grades of milk, excepting the bacterial standards, 

 which in 20 per cent, cream shall not exceed five tunes the 

 bacterial standard allowed in the grade of milk. 



Ice Cream. Made and handled under sanitary conditions 

 it contains mostly Bacillus lactis acidi type, not dangerous; 

 but if made from milk and cream containing putrefactive 

 bacteria, freezing w r ill not prevent further growth and bac- 

 terial poisons may be developed, causing sickness and death. 

 An examination of specimens collected gave as the lowest 

 count 50,000 bacteria per cubic centimeter, and the highest 

 150,000,000 per cubic centimeter. 



