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
Walthamstow 1947
[Report of the Medical Officer of Health for Walthamstow]
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29
Ice Cream (Heat Treatment, Etc.), Regulations, 1947.
The attention of all manufacturers and vendors was called to
the requirements of these Regulations.
Several manufacturers are taking this opportunity of bringing
their plant up to date.
Medical Examination—Typhoid, Etc., Carriers.
A letter was addressed to the trade offering facilities for a free
medical examination to those employed in the manufacture or sale
of ice cream. A reasonable response was received and of those
examined none was found to be a " carrier."
Bacteriological Quality and Grading of Ice Cream.
Thirty-seven samples were submitted for bacteriological examination
and grading in accordance with the Provisional Test of the
Ministry of Health.
The following is a comparative summary showing the results of the examination of 37 samples by the old standard test and the new (provisional) test. In the latter, Grades 1 and 2 are considered satisfactory.
| Old Standard Test | New (Provisional) Test | ||||||
|---|---|---|---|---|---|---|---|
| Plate Count | Coliform Reaction (in 1/10 ml.) | Bacterium coli (in 1/10 ml.) | Very satis' factory | Satis fac tory | Not satis factory | Methylene Blue Test | |
| Reduction time | Grade | ||||||
| 25,000 | Absent | Absent | X | 4½hours | 1 | ||
| 1,000 | ,, | ,, | X | 4½„ | 1 | ||
| 1,500 | Present | ,, | X | 4½ „ | 1 | ||
| 500 | Absent | ,, | X | 4½ „ | 1 | ||
| 40,000 | ,, | ,, | X | 4½ „ | 1 | ||
| 3,000 | Present | ,, | X | 4½„ | 1 | ||
| 9,000 | Absent | ,, | X | 4½„ | 1 | ||
| 2,500 | „ | ,, | X | 4½„ | 1 | ||
| 2,500 | ,, | ,, | X | 4 ,, | 2 | ||
| 4,000 | ,, | ,, | X | 3½ „ | 2 | ||
| 1,800 | ,, | ,, | X | 3½ „ | 2 | ||
| 3,000 | Present | ,, | X | 3½ „ | 2 | ||
| 2,800 | Absent | ,, | X | 3½ „ | 2 | ||
| 600 | ,, | ,, | X | 3½ „ | 2 | ||
| 5,000 | ,, | ,, | X | 2½ „ | 2 | ||
| 38,000 | ,, | ,, | X | 3 ,, | 2 | ||
| 8,000 | ,, | ,, | X | 2½ „ | 2 | ||
| 30,000 | ,, | ,, | X | 2½„ | 2 | ||
| 7,000 | Present | ,, | X | 2 „ | 3 | ||
| 12,500 | Absent | ,, | X | 1 | 3 | ||
| 26,000 | ,, | ,, | X | 4½ „ | 3 | ||
| 50,000 | Present | ,, | X | 1 | 3 | ||
| 20,000 | Absent | ,, | X | 1 | 3 | ||
| 600,000 | Present | ,, | X | 0 „ | 4 | ||
| 270,000 | Absent | ,, | X | 0 „ | 4 | ||