Studies of Differential Media for Detection of Bact. Coli in Water

Dunham, H. G.; McCrady, M. H.; Jordan, Harry E.

doi:10.1002/j.1551-8833.1925.tb12509.x

Cited by 19 publications

(6 citation statements)

References 9 publications

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“…Sears and Putnam (12) definitely showed that various combinations composed of one organism that forms acid but no gas from lactose, with another that does not ferment lactose but forms gas from glucose, may produce gas from lactose, and that symbiotic action of this sort may explain many false presumptive tests. Sohn (8), Leitch (13) and Dunham, McCrady and Jordan (14) have emphasized the same view. It seems from the observations of Castellani (15) (16) and Fiallos (17) that this phenomenon, for which Holman and Meekison (18) have recently and appropriately suggested the use of the term "bacterial synergism," is wide spread in nature.…”

Section: The Presumptive Testmentioning

confidence: 91%

The Practical Utility of Bacteriologic Control of Water Supplies

Hall¹

1928

Journal AWWA

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The sole significance of bacteria in water supplies relates to the transmission of the water borne diseases,-typhoid fever, the paratyphoids (alpha and beta), the dysenteries (protozoan and bacterial), and cholera. The specific causes of all of these diseases were discovered since 1880 and the accumulating epidemiological evidence that they were frequently transmitted by drinking water led immediately to the hope that their detection in water might serve as a criterion of its potability.But this hope was soon frustrated, for the occasions upon which these organisms have been isolated directly from naturally polluted water supplies are few indeed. There are three principal reasons why the intestinal pathogens can only rarely be recovered from water supplies, (1), the relatively small number of organisms present in proportion to non-pathogenic forms, (2), their transitory persistence in water, (3), their uniform lack of distinguishing characteristics among many harmless species naturally present.For these reasons the water sanitarian has been mainly interested in discovering criteria of pollution rather than the detection and recognition of specific causative agents of disease in water. The useful criteria are both chemical and bacteriological.Chemical tests of water polluted with sewage show abnormal quantities of chlorides, derived from kitchen wastes, urine and feces, and a high organic content as indicated by nitrogenous compounds and a large oxygen demand. The form in which nitrogen is present is quite important; ammonia indicates recent pollution, while nitrites and nitrates indicate more remote pollution owing to partial or complete oxidation.But the more direct criteria of fecal pollution are bacterial. This 1 Presented before the Rocky Mountain Section meeting,

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Section: The Presumptive Testmentioning

confidence: 91%

The Practical Utility of Bacteriologic Control of Water Supplies

Hall¹

1928

Journal AWWA

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“…of laboratories in a study of brilliant green bile as a culture medium for a simple presumptive test for the presence of coliform organisms. The first report on the results of this work was published in 1925 (7). The procedure investigated was found to lack some of the requirements of a dependable coliform test, but the results obtained were so encouraging that further study was indicated.…”

Section: Us Drinking Water Standardsmentioning

confidence: 99%

Laboratory Procedures and Water Standards

McCrady¹,

Archambault²

1947

Journal AWWA

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“…coli group, much more so than the present "Confirmed" technique which involves a transplant from lactose bouillon to endo or E. M. B. agar. The writer suggested its utility in 1925 (7) and later dismissed it for what appeared to him to be the superior diagnostic value of the parallel planting procedure.…”

Section: H Mccrady:5mentioning

confidence: 99%

Discussion

1932

Journal AWWA

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Studies of Differential Media for Detection of Bact. Coli in Water

Cited by 19 publications

References 9 publications

The Practical Utility of Bacteriologic Control of Water Supplies

The Practical Utility of Bacteriologic Control of Water Supplies

Laboratory Procedures and Water Standards

Discussion

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