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Communicable Diseases

Communicable Diseases

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A picture of the human body with the sites in the body (in addition to the blood) where cells of the human immune system are concentrated labelled.
Figure 20.3  The sites in the body (in addition to the blood) where cells of the human immune system are concentrated. (Source: The Open University, SXR376 Preparatory Reading, Figure 1.2, page 7)

 20.2.2  The human immune system