Answer
d
Work Step by Step
The causes of natural immunodeficiency include a recessive gene resulting in the lack of a thymus gland, a recessive gene resulting in only a few B cells, and the presence of an HIV infection.
Microbiology: An Introduction, 11th Edition
by Tortora, Gerard J.; Funke, Berdell R.; Case, Christine L.
Published by
Benjamin Cummings
ISBN 10:
0321733606
ISBN 13:
978-0-32173-360-3
Chapter 19 - Disorders Associated with the Immune System - Study Questions - Multiple Choice - Page 557: 5
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