Based on the milk samples taken from the city of Ribeirão Preto, Brazil, the occurrence of AFM1 does not appear to be a serious public health hazard under Brazilian legislation. The effects on AFM1 of cheese and yoghurt storage are minimal. The fermentation process of yoghurt manufacture has no effect on AFM1. The total AFM1 content in milk and in cheese and whey prepared from the milk decreased approximately 25%. The concentrations of AFM1 in cheese and whey were 1.9- and 0.4-fold of that for the milk used for cheese production.