Immune system disorders occur when the body's immune system does not function properly. The immune system is a complex network of cells, proteins, tissues, and organs that work together to fight off harmful substances and disease-causing microorganisms called pathogens. A healthy immune system helps protect the body from disease, infection, and cancer.
Immune deficiencies occur when an individual's ability to fight against an infectious disease is compromised or entirely absent. Patients who suffer from immune deficiencies experience recurrent infections, such as sinusitis and pneumonia. The World Health Organization (WHO) has identified nearly 100 primary immune deficiency diseases.
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