What event triggers an adaptive immune response?单项选择题

题目图片
A

a. When neutrophils are recruited to the site of infection

B

b. When the levels of antigen cross a threshold

C

c. When macrophages phagocytose viruses

D

d. When dendritic cells migrate to the lymph nodes

E

e. When immunological memory is formed

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What determines if there is an adaptive immune response?

Are there symptoms during the adaptive immune response?

When does the adaptive immune response start?

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