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Microbiol Immunol. 1992;36(6):583-91.

Prevalence of Clostridium botulinum type E and coexistence of C. botulinum nonproteolytic type B in the river soil of Japan.

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Department of Bacteriology, School of Medicine, Kanazawa University, Ishikawa, Japan.


Soil samples from 98 sites in the whole systems of four rivers in Japan were examined for the presence of Clostridium botulinum. Type E organism was prevalently shown throughout the whole river systems including upper part; detection rates of type E toxin in soil culture ranged from 33 to 82%. This type was also detected in soil of adjacent mountainous district. Type B and C toxins were detected at 7% and 9% of the sites examined, respectively. C. botulinum type E and nonproteolytic type B strains were isolated from enrichment cultures of soil samples. These results suggest that the terrestrial origin of type E organism would be considered as one of the reasons for the high incidence of this organism in the sea areas, and prove that C. botulinum nonproteolytic type B exists in the soil of Japan.

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