Biology 2010 Student Edition

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

Chapter 20, Viruses and Prokaryotes - 20.3 - Diseases Caused by Bacteria and Viruses - 20.3 Assessment - Page 592: 1b

Answer

Vaccines can be effective before the disease as they work by strengthening the immune system by introducing weakened pathogens to the body.

Work Step by Step

Vaccines can be effective before the disease as they work by strengthening the immune system by introducing weakened pathogens to the body.
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