Summary
Organisms of coli group which were isolated from intestines of oysters taken from clear uncontaminated sea water are studied biologically, particularly on the relation with those of human origin.
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1.
Organisms of coli group isolated from intestines of oysters amounted 16 groups, 263 cultures; they are divided into three species A, B and C types.
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2.
A and B types are those known as organisms of coli group of fish origin, and possess the following characteristics: rod-shaped, gramnegative, non-spore, gelatine-liquefaction, actively-motile, non-fermentation of xylose, rhamnose, dulcitol, raffinose, erythritol, with an optimum temperature from 25° C to 30° C.
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3.
C type corresponds to Aerobacter aerogenes (Kruse) Beijerinck, but its presence in the intestines of oysters is not considered due to contamination of human feces.
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4.
Organisms of coli group of fish origin differ from those of human origin in the following characteristics: motility; gelatine-liquefaction; fermentation of xylose, raffinose, rhamnose, dulcitol and other carbohydrates and polyhydric alcohols; production of indol; optimum temperature.
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5.
Aerobacter aerogenes isolated from intestines of oysters is identified from organisms of coli group of human origin in its being positive for Voges-Proskauer's test.
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6.
From the result of experiment on auto-disinfectious action of oysters, organisms of coli group of oysters origin are not considered to parasite temporarily in the intestines of oysters.
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7.
It is considered that the frequently alledged presence of organisms of coli group of human origin in fresh oysters may due to bad handlings of material.
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8.
The present author was unable to find human-origin coli group from oysters which were cultivated by the “Hanging Method” in clear sea, or cultivated normally in clear sea water, or in those that grow naturally in clear sea.
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Tanikawa, E. Biological studies on the organisms of coli-group isolated from the intestines of oysters. Archiv. Mikrobiol. 8, 288–306 (1937). https://doi.org/10.1007/BF00407202
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DOI: https://doi.org/10.1007/BF00407202