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
Croydon 1946
[Report of the Medical Officer of Health for Croydon]
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| Present. | Absent. | Over 100,000 per M.l. | Under 100,000 per M.l. | Present. | Absent. | Present. | Absent. | Exceeding a trace. | Not exceeding a trace. | Satisfied. | Not satisfied. | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tubercle bacillus | — | 113 | — | - | — | — | — | — | — | — | — | — |
| Total number of bacteria. | — | — | 18 | 95 | — | — | — | — | — | — | — | — |
| Blood | — | — | — | — | — | 113 | — | — | — | — | — | — |
| Pus | — | — | — | — | — | — | - | 113 | — | — | — | — |
| Detritus | — | — | — | — | — | — | — | — | — | 113 | — | — |
| Methylene Blue Test | - | - | - | - | - | - | - | - | - | - | 86 | 27 |
| Totals | - | 113 | 18 | 95 | — | 113 | - | 113 | — | 113 | 80 | 27 |
BACTERIOLOGICAL EXAMINATIONS OF ICE CREAM.
104 samples of ice cream were obtained for bacteriological examination, with results as follows : —
| Bacterial Count. | |
| Organisms per ml. | No. of Samples. |
| Under 1,000 | 21 |
| Over 1,000 and under 10,000 | 29 |
| Over 10,000 and under 50,000 | 22 |
| Over 50,000 and under 100,000 | 5 |
| Over 100,000 and under 200,000 | 2 |
| Over 200,000 and under 500,000 | 3 |
| Over 500,000 and under 1,000,000 | 3 |
| Over 1,000,000 | 19 |
| Total | 104 |
| Bacillus Coli. | No. of Samples. |
| Absent in 1/ 10th cc. | 69 |
| Present in 1 / 10th but absent in 1/100th cc. | 7 |
| Present in 1 / 100th but absent in 1/1,000 cc | 11 |
| Present in 1/1,000 cc. | 17 |
| Total | 104 |
There is no bacteriological standard for ice cream. In those
cases, however, where the bacterial count exceeded 100,000 or coli
was present in 1/10th of a cc., the suppliers were visited and
communicated with and later re-sampled.