ABC News: We spoke to experts about food poisoning, tummy bugs, expiry dates and human tendency to hedge our food bets as part of National Science Week. Many bacteria that cause food poisoning already exist in the guts of animals or in raw food. The point at which they can make someone sick depends on the person’s immune system and how much the bacteria has multiplied under certain conditions, such as food not being stored below 5C. Viruses can also be spread by food and make you sick, such as hepatitis A spread on unwashed salads or oysters raised in contaminated water.

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