Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 35, Immune System and Disease - Assessment - 35.4 Immune System Disorders - Understand Key Concepts/Think Critically - Page 1031: 26



Work Step by Step

The main targets of HIV are the helper T cells, which are the control centers of the immune system. The T cell count is the indicator of how advanced the disease has become. When the number of T cells gets down to a sixth of normal, the patient is diagnosed with AIDS.
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