Immune system is a system that protect body from harmful microorganism.
The capability of body to fight against microorganism is immunity.
The components of immunue system is skin, antibody, white blood cell.
Skin plays primary role to protect microorganism. It at first protect entering of microorganism into body.
Antibody is a special types of protein that fight against specific types of microorganism.
When any antigen enter into body, body identified it and starts to produces special structure of antibody if it can destroy this specific type of antigens further attack.
White Blood Cell （WBC）plays an important role to protect microorganism.
Disease caused by microorganism is called infectious disease.
Inflamation caused by microorganism is infection.
Immunity prevent infection. Infection may be caused by Virus, Bacteria, Protozoa and Fungus.
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