Answer
It means that either a) the host has a natural immunity or b) the pathogen is a symbiont, or in other words is not harmful.
Work Step by Step
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Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 35, Immune System and Disease - 35.1 - Infectious Disease - 35.1 Assessment - Page 1013: 1c
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