Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Lewisham Borough]
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Source of supply | BEFORE TREATMENT | AFTER TREATMENT | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Agar plate count per ml. | Coliform count | Escherichia coli count | Agar plate count per. ml. | Coliform count | E. coli count | |||||||
Number of samples | 20-24 hours at 37 °C | 3 days at 22 °C. | Per cent, samples negative in 100 ml, | Count per 100 ml. | Percent, samples negative in 100 ml. | Count per 100 ml. | Number of samples | 20-24 hours at 37°C. | 3 days at 22 °C. | Percent.. samples negative in 100 ml. | Percent, samples negative in 100 ml. | |
Bexley | 248 | 0.0 | 2 | 99.60 | — | 100.0 | — | 255 | 0.0 | 19 | 100.0 | 100.0 |
Darenth | 248 | 0.3 | 67 | 97.18 | 0.1 | 98.79 | — | 254 | 0.0 | 1 | 100.0 | 100.0 |
Deptford | 248 | 2.6 | 28 | 91.53 | 1.8 | 96.77 | 0.1 | 254 | 3.1 | 216 | 100.0 | 100.0 |
Wilmington | 248 | 1.4 | 29 | 96.77 | 0.1 | 98.79 | — | 255 | 0.2 | 3 | 100.0 | 100.0 |
All Thames derived | 3,569 | 14.1 | 99.44 | 99.97 |