It can occur if foods touch directly, if one food drips on to another, if your hands or utensils or equipment such as knives or chopping boards touch one food and then another.Wash your hands after touching raw foods.Separate raw and cooked or 'ready-to-eat' foods.Keep raw meat in a sealable container at the bottom of the fridge.do not use the same surface or chopping board for preparing raw and re