London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Shoreditch 1931
[Report of the Medical Officer of Health for Shoreditch]
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62
Milk (Special Designations) Order, 1923.
The following table shows the results of bacteriological analysis of samples of milk sold under this Order: —
| No. of Sample. | Designation of Milk. | No. of bacteria per cubic centimetre. | Presence of coliform bacillus. | Remarks. |
|---|---|---|---|---|
| 26 | Certified | 25,700 | Absent | Sample conforms to requirements of Order. |
| 27 | Certified | 9,780 | Absent | do. do. |
| 28* | Grade "A" | 454,000 | Present in | Does not conform— |
| T.T. | 0.01 c.c. | letter sent. | ||
| 29* | Grade "A" | 495,000 | Present in | do. do. |
| T.T. | 0.01 c.c. |
* Milk sold as Grade "A" (Tuberculin tested) shall be produced and
treated under such conditions that on a sample being taken at any time before
delivery to the consumer the milk shall be found to contain : —
(a) not more than 200,000 bacteria per cubic centimetre; and
(b) no coliform bacillus in one-hundredth of a cubic centimetre.
Undesignated Milk.
The results of the bacteriological examination of nine samples of ordinary milk are given in the following table: —
| Sample No. Date when taken. | B. Coli present. | Colonies growing at 37 C. per c.cm. | Colonies growing at 22 C. per c.cm. | B. Sporogenes and Welchii present in 10 c.cm. |
|---|---|---|---|---|
| 30 10.9.1931 | Present in 1.0 c.cm. | 34,100 | 11,300 | Present. |
| 31 do. | ,, 1.0 c.cm. | 64,600 | 15,900 | Present. |
| 32 do. | ,, 1.0 c.cm. | 59,300 | 12,800 | Absent. |
| 33 do. | ,, 0.01 c.c.m. | 63,200 | 14,200 | Present. |
| 34 do. | ,, 0.001 c.cm. | 72,700 | 38,600 | Present. |
| 35 do. | ,, 0.01 c.cm. | 64,200 | 23,700 | Present. |
| 36 27.11.1931 | ,, 0.000001 „ | 1,136,000 | Complete liquefaction | Present. |
| 37 do. | ,, 0.00001 c.cm. | 704,000 | Complete liquefaction | Present. |
| 38 do. | ,, 0.00001 c.cm. | 608,000 | Complete liquefaction | Present. |
For purposes of comparison it may be noted that the bacteriological
standard required in the Milk (Special Designations) Order for Certified Milk
which is the highest grade of designated milks is as follows: —
On a sample being taken at any time before delivery to the consumer the
milk shall be found to contain—
(a) not more than 30,000 bacteria per cubic centimetre, and
(b) no coliform bacillus in one-tenth of a cubic centimetre.