On conditions necessary to obtain a clean milk supply and on methods of testing cows' milk in relation to standards of cleanness : report to the Sub-committee on clean milk / by S. Delépine, June 16th, 1918.
- Auguste Sheridan Delépine
- Date:
- 1918
Licence: In copyright
Credit: On conditions necessary to obtain a clean milk supply and on methods of testing cows' milk in relation to standards of cleanness : report to the Sub-committee on clean milk / by S. Delépine, June 16th, 1918. Source: Wellcome Collection.
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![The recommendations relating to the grading of raw milk on the basis of bacterial counts are summed up in the following passages taken from the report:— P. 274.—Standard milk should contain not less than 8.5 per cent, of solids not fat, and not less than 3.25 per cent, of milk fat. P. 282.—The Commission believes that all milk should be classified by dividing it into three grades. Raw Milk.—Grade A.—Milk of cows free from disease as determined by tuberculin tests and physical examination by a qualified veterinarian. Milk produced and handled by employees free from disease, as deter¬ mined by medical inspection of a qualified physician, under sanitary conditions such that the bacterial count shall not exceed 10,000 per cubic centimetre at the time of delivery to the consumer. Grade B,—Milk from cows free from disease as determined by ]3hysical examination, of which one each year shall be by a qualified veterinarian, and produced and handled under sanitary conditions, such that the bacterial counts at no time exceeds 1,000,000 per cubic centimetre. Grade C.—Milk from cows free from disease as determined by physical examinations produced under conditions such that the bacteria count is in excess of 1,000,000 per cubic centimetre. Whenever any large city or community finds it necessary on account of the length of the 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. P. 277.—The standard methods of the American Public Health Associa¬ tion, Laboratory Section, to be adopted as standards for making the bacterial counts. (The medium recommended by this Association is nutrient agar containing 1 per cent, of agar and of a reaction of +1.5. The plates are incubated at 37° C. for 40 to 48 hours.) P. 291-293,—The first meeting of the Commission was held at the New York Academy of Medicine on May 22nd, 1911. Conferences leading to it had previously been held in 1907 at Washington, and in 1910 at New York. • Addendum 2. I have often in past years attempted, without great success, to estimate the loss due to premature souring of milk. The only information I have been able to obtain on this point will be found in the second interim report of the Committee on the Productions and Distribution of Milk (London, November 30th, 1917), from which the following lines are quoted (22, p. 6.) :— “ One firm stated that the quantity of milk received in a sour condition betAveen April and August, 1917, Avas over 4,000 churns— approximately 68,000 gallons, Avith a value of about £4,000—and '' several independent witnesses gave it as their opinion, based on](https://iiif.wellcomecollection.org/image/b29930303_0085.jp2/full/800%2C/0/default.jpg)
