Alberta Food Safety Basics Booklet - Alberta Health Services

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6 FACTS Food that contains harmful microbes (germs) or their toxins (poison) may look, taste, and smell normal. In many cases, foodborne illness is not caused by the last meal or food eaten. It can take time for symptoms to develop. With E. coli O157:H7 infection (a type of foodborne illness), it can take 2-10 days for the signs of illness to appear.

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