These types of foods are loaded with proteins and nutrients which bacteria use to grow and reproduce. Microwaves cook foods in a different way from your conventional oven. Cooking occurs when the microwave causes food particles to vibrate. This constant vibration causes friction between the particles which creates heat. This is how your food gets hot in the microwave.
Most microwaves only penetrate a few centimetres into the food.
The centre of the product cooks when heat from the outside penetrates inward. You have probably noticed this when you defrost foods such as mince. Microwaves don't always cook evenly. This means that you can have hot and cold spots in the food. All of the food needs to be hot so that any bacteria present can be killed.