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 Greenwich Borough]
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Source of supply | BEFORE TREATMENT | AFTER TREATMENT | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of samples | Agar plate count per ml. | Coliform count | Escherichia coli count | Number of samples | Agar plate count per ml. | Coliform count | E. coli count | |||||
20-24 hours at 37°C. | 3 days at 22°C. | Per cent. samples negative in 100 ml. | Count per 100 ml. | Per cent. samples negative in 100 ml. | Count per 100 ml. | 20-24 hours at 37°C. | 3 days at 22°C. | Per cent. samples negative in 100 ml. | Per cent. samples negative in 100 ml. | |||
Hampton | 1,136 | 11.4 | 99.82 | 100.00 | ||||||||
Surbiton | 432 | 3.8 | 99.54 | 99.77 | ||||||||
Deptford | 248 | 2.6 | 28 | 91.53 | 1.8 | 96.77 | 0.1 | 254 | 3.1 | 216 | 100.00 | 100.00 |
Wilmington | 248 | 1.4 | 29 | 96.77 | 0.1 | 98.79 | 255 | 0.2 | 3 | 100.00 | 100.00 | |
Darenth | 248 | 0.3 | 67 | 97.18 | 0.1 | 98.79 | — | 254 | 0.0 | 1 | 100.00 | 100.00 |
Bexley | 248 | 0.0 | 2 | 99.60 | — | 100.00 | — | 255 | 0.0 | 19 | 100.00 | 100.00 |
(a) Wansunt No. 1 | 178 | 0.0 | 108 | 100.00 | - | 100.00 | 184 | 0.0 | 127 | 100.00 | 100.00 | |
(b) „ No. 2 | 175 | 0.0 | 81 | 99.43 | — | 100.00 | - | |||||
(a) Crayford No. 1 | 87 | 0.0 | 16 | 100.00 | 100.00 | - | 255 | 0.1 | 1 | 100.00 | 100.00 | |
(b) „ No. 2 | 138 | 0.0 | 12 | 100.00 | 100.00 | - | ||||||
(c) „ No. 3 | 110 | 0.0 | 10 | 100.00 | - | 100.00 | - |