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As well as the immune system the body has several other ways to defend itself against pathogens, such as bacteria, parasites, toxins, fungi and viruses. Your body has two lines of defence against pathogens. The first line of defence includes physical and chemical barriers that are always ready and prepared to defend the body from infections.
The Immune system function keeps a record of every microbe it has ever defeated in types of white blood cells(B- and T- lymphocytes) known as memory cells. This means it can recognize any cell changes and destroy the microbes quickly if it enters the body again and before it can multiply itself and make you feel sick.