Answer
It tells us that the two viruses are antigenically very similar.
Work Step by Step
For two viruses to elicit essentially the same immune response, they must have very similar antigens on their surfaces.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 51 - The Immune System - Figure 51.8 - Inquiry Question - Page 1065: 1
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