[To the multiplication ability of intestinal bacteria in water (author's transl)]

In three series of laboratory tests, the influence exercised on intestinal bacteria by waste water from dairies, breweries, starch factories and the meat-processing industry, as well as by the individual potential nutritive substances such as casein, yeast autolysate, starch and bovine serum was examined in native and sterilised surface water. This was the continuation of the experiments with waste water from sugar factories. All substances tested so far can being about a growth of potentially and obligate pathogenic bacteria. However, the influence exercised by the different types of waste water and their potential nutritive substances varies. Yeast autolysate has the most striking effect, e.g. E. coli grow in the order of 4-5, P. aeruginosa in the order of 2-3, and in the order of 1-2 in the case of the 2 serotypes examined, S. enteritidis and S. schottmuelleri. A lesser effect was produced by casein, while the influence exercised by starch and bovine serum was minimal or nil. When nutritive substances are again added, the growth of all test organisms examined is less marked and it is mainly attributable to the action of yeast autolysate and casein. However, the possibility of a secondary increase of the potential infectiousness of the water under the influence of specific trophic conditions of the outfall, was clearly demonstrated.