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?
Answer
A
active because he built up antibodies due to exposure to the flu
B
active because his parents vaccinated him against the flu
C
passive because his mother passed on the flu antibody
D
passive because he had antibodies added to his blood
Explanation
Akio’s immune system responded to the flu infection by making antibodies and developing immune memory. Immunity that develops after a person’s own immune system responds to an infection is active immunity. So the correct choice is “active because he built up antibodies due to exposure to the flu.”
AI-written and checked against the verified answer.