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L. MENETRIER, J. LABONDE and M. C. HANNOUN Totals Rivers: Upstream of Paris Downstream of Paris General Hospitals & Preventoriums: Discharge from exit of processing plants River at level of waste discharge from preventorium River downstream Sanatoriwns: Discharge from exit of processing plants River at level of waste discharge Origin of samples 128 86 7 7 1 42 5 15 0 8 8 12 22 3 1 4 17 0 12 12 5 20 18 gauze 31 1 liter Mode of sampling 49 Total number of samples 81 18 5 12 2 7 16 5 4 19 Negative 0 0 1 1 0 1 Indetermined (polluted culturesearly death of guinea-pigs) 42 0 0 1 3 7 0 29 Number Positive Results TABLE 3.

HANNOUN Summer Type Distribution 20 Km • Euryhohne Type A Stenoholine Type Figures represent station number FIG. 1. Distribution of pathogenic halophilic bacteria in Sagami Bay (Y. MIYAMOTO, K. NAKAMURA and K. TAKIZAWA, 1960 1st Oceanic Survey, Oct. ) —O- Subgroup I —A— Subgroup 2 2 3 4 5 6 7 8 9 10 II 12 Concentration of N a C I ( % ) FIG. 2. Response curves of 3 subgroups of the halophilic organisms to high concentration of sodium chloride. (R. SAKAZAKI, S. IWANAMI and H. ) Modern Microbiological and Virological Aspects of Water Pollution 13 patients was distributed widely in coastal sea water and sea fish, especially during the spring, summer and autumn.

This can be explained by the fact that the actual nomenclature of the enteroviruses is based on the study of isolated cultures from samples of human origin, mostly from pathological cases. Here, on the contrary, investigations apply to an environment of much more dis­ similar origin where the contamination comes from healthy carriers, from nonpathogenic viruses perhaps, or from contaminations of animal origin. Likewise, the equally high proportion of other non-identified viruses could be subject to the same commentaries and it would be interesting to study experimentally the pathogenicity of these unknown viruses.

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