Biological contamination happens when tiny, living things like bacteria, viruses, or mold get onto things where they don't belong, like food or surfaces we touch. Just like people, they're too small to see without a special tool like a microscope. If they get onto your food or your body and start growing, they can make you sick.
It's like when you have a cut on your finger and a tiny piece of food gets in it. Just like how the food can make your finger hurt or get infected, the tiny living things can make you sick.
To prevent biological contamination, we need to keep things clean! This means washing our hands often with soap and water, cleaning surfaces and objects that we touch regularly, cooking food well, and keeping it at safe temperatures. By doing these things, we can help keep ourselves and others healthy and free from sickness.