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24 December, 18:52

Akio just got over having the flu. His brother just got the flu. His parents are not worried about Akio getting it again because he built up an immunity to this flu strain. Which explains the type of immunity he built up?

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Answers (2)
  1. 24 December, 19:28
    0
    I think the answer is B

    Explanation:

    I took the test got 100%
  2. 24 December, 21:06
    0
    active because he built up antibodies due to exposure to the flu
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