Cross-contamination is a common cause of food poisoning. Certain foods need to be kept separate from each other due to the different bacteria that they carry.
In particular, raw and cooked meat should be kept separate to one another. Ensure that raw food is stored on the lower shelves of the fridge in leak proof containers to prevent spills into other food.
When preparing food, use separate cutting boards, plates and utensils for raw and cooked foods and/or meat and vegetables.
When transporting food always use leak proof containers and keep raw food at the bottom of the esky to prevent juices from dripping onto other food.