Maize samples collected from fields, farm storages, middleman storages and food shops in Vietnam from May 1995 to August 1996 were analyzed for aflatoxin B1. The aflatoxin B1 productivity of Aspergillus flavus and Aspergillus payasitisus strains isolated from maize in North of Vietnam was also shown. The highest average levels of aflatoxin B1 was 130 ppb in maize kernel of Thanh Hoa-Nghe An province. One out of 10 of ear type samples from Ha Tay and two out of 10 of those from Thanh Hoa were contaminated at the level of 20 ppb and 60 ppb of aflatoxin, respectively. No aflatoxin was detected in maize based products. Twenty samples of maize kernel from provinces Ha Tay, Thanh Hoa, Son la in the North of Vietnam were collected for ochratoxin A analysis. Only one out of 20 samples was contaminated with ochratoxin A at the level of 90 ppb.

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