We do not need to protect ourselves against all bacteria. Some live inside out body and are even very important to us, such as the intestinal bacteria. We fall sick only if there are too many bacteria or some harmful bacteria unknown to the body comes form outside. This can happen easily via cuts and bruises on the skin or when our bodies are weak. Antibiotics help against bacterial infections. Unfortunately, they are not always effective because many bacteria have already become 'resistant' to them. The best way to stay healthy is to strengthen our own immune system. A diet rich in vitamin, i.e., fruits and vegetables and exercise in fresh air helps in keeping us fit.
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