The purpose and functions of the immune system
The main function of the immune system is to protect you from harmful microorganisms that can cause infections. However, it doesn’t just stop at prevention. If you do get sick, your immune system, by default, becomes your body’s first line of defence, and will fight the infection by working to minimise the amount of damage done to your body. A healthy immune system will be able to fight off most infections. A weakened immune system, on the other hand, can make you prone to illnesses which can last for longer, and symptoms that are more severe.