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 Orpington]
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BACTERIOLOGICAL RESULTS
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. | |||
Sundridge No. 1 | 61 | 0.0 | 8 | 100.0 | — | 100.0 | — | 242 | 0.0 | 10 | 100.0 | 100.0 |
Sundridge No. 2 | 96 | 0.1 | 2 | 100.0 | — | 100.0 | — | |||||
Sundridge No. 3 | 99 | 0.1 | 11 | 100.0 | — | 100.0 | — | |||||
Sundridge No. 4 | 87 | 0.0 | 11 | 98.85 | — | 100.0 | — | |||||
Lullingstone No. 1 | 157 | 9.4 | 57 | 100.0 | — | 100.0 | — | 252 | 0.1 | 11 | 100.0 | 100.0 |
Lullingstone No. 2 | 102 | 0.3 | 9 | 99.02 | — | 100.0 | — | |||||
Eynsford No. 1 | 235 | 1.7 | 37 | 83.40 | 0.9 | 99.57 | — | 247 | 0.1 | 4 | 1000 | 100.0 |
Eynsford No. 2 | 122 | 0.5 | 15 | 91.80 | 0.3 | 99.18 | — | |||||
Horton Kirby No. 1 | 177 | 0.0 | 79 | 96.61 | 0.1 | 98.31 | 0.1 | 255 | 0.0 | 15 | 99.22 | 100.0 |
Horton Kirby No. 2 | 196 | 0.0 | 5 | 97.96 | 0.1 | 98.47 | 0.1 | |||||
Orpington | 232 | 0.0 | 14 | 98.71 | — | 100.0 | 237 | 1.7 | 97 | 99.58 | 99.58 | |
North Orpington No. 1 | 159 | 2.6 | 46 | 18.24 | 11.5 | 32.70 | 5.0 | 254 | 1.2 | 5 | 100.0 | 100.0 |
North Orpington No. 2 | 141 | 1.1 | 57 | 34 .04 | 6.3 | 50.35 | 3.6 |