The food safety pillars is a system designed to actively manage food safety risk and therefore reduce the chance of causing food poisoning.
Food Safety is defined as handling, preparing and storing food in a way that reduces the risk of individuals becoming sick from foodborne illnesses. These risks include contamination from biological, physical or chemical sources. Food safety systems or food hygiene programs are designed to minimise these risks.
Here's the deal, microwaves don't actually kill bacteria. The microwaves instead create heat that is able to kill bacteria in foods. But microwaved foods can cook unevenly because of irregular shapes or differences in thickness. Think about a solid frozen meal compared to reheating a soup. Even turntable-equipped microwave ovens can cook unevenly and leave cold spots where harmful bacteria can survive.
It takes several steps to get food from farm to fork. We call these steps, "The food production chain". Contamination can occur at any point along this chain during production, processing, distribution and preparation.