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When is the adaptive immune system active?

A All the time
B Only when there's a repeat infection
C Only after pathogens start to multiply
D Only when a person acquires autoimmunity

1 Answer

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Step-by-step explanation:

Adaptive immunity is an immunity that occurs after exposure to an antigen either from a pathogen or a vaccination. This part of the immune system is activated when the innate immune response is insufficient to control an infection

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