immune system 
noun
The organs and processes of the body that provide resistance to infection and toxins. Organs include the thymus, bone marrow, and lymph nodes.The infection causes the immune system to activate white blood cells and chemicals to fight the bacteria....
- They also discovered that the host animal must have a healthy immune system for infection to take hold.
- Premature babies are at increased risk of infection because their immune systems are immature.
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