Essentials of Human Anatomy & Physiology (12th Edition)

Published by Pearson
ISBN 10: 1292216239
ISBN 13: 978-1-29221-623-2

Chapter 12 - The Lymphatic System and Body Defenses - Review Questions - Page 461: 38

Answer

Since flu viruses have a high mutation rate every year new strains of them are generated which will not be detected by the memory cells generated for previous strain of the virus. So when a new strain of flu virus comes a new flu vaccine is necessary to form immunity for new strains of the virus.

Work Step by Step

Same as above.
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