Abstract

In Kanagawa Prefecture, located in central Japan, aflatoxin-producingAspergillus flavus was isolated in 4 (2.5%) of 160 field soil samples. In the 4 fields, whose soil contained aflatoxin-producingA. flavus, the annual average temperature of the sampling sites of the soil ranged from 13.8 to 15.1°C. Of all the isolated strains of aflatoxin-producingA. flavus, 4 strains, isolated from a single soil sample, produced large amounts of aflatoxin B1 and B2 when incubated in coconut agar, peanut agar, peanuts or trilaurin-added rice, although they did not produce aflatoxin when incubated in rice, yeast extract-sucrose broth or sucrose-low salts broth.

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