Question

select all the correct answers.
adrian caught a virus while staying with his grandmother. a few years later, his mother and sister got the same virus. this virus could spread through touch and direct contact. however, adrian did not contract the virus this time, even though he was living with his mother and sister. why did he not get sick?

adrians adaptive immunity remembered the antigens from the virus and gave him lifelong immunity to it.
adrians innate immunity remembered the antigens from the virus and gave him lifelong immunity to it.
adrians skin layer recognized the antigens and attacked them, which prevented the occurrence of the virus again.
adrians innate immunity identified antibodies specific for the virus and targeted them against the antigen.
adrians adaptive immunity produced a higher amount of specific antibodies for the antigen, preventing the virus.

Explanation:

1. Adaptive immunity (specific immunity) remembers antigens from previous infections and can provide long - term or lifelong immunity. When Adrian was first infected, his adaptive immune system (like B and T cells) recognized the virus's antigens. Later, when exposed again, the memory cells in adaptive immunity can quickly respond, either by remembering the antigen to give lifelong immunity (first option) or by producing more specific antibodies (fifth option) to fight the virus.
2. Innate immunity is non - specific and does not have memory of specific antigens. So the options about innate immunity (second and fourth) are wrong.
3. The skin is part of innate immunity and is a physical barrier, not a recognition and attack system for specific antigens. So the third option is wrong.

Answer:

A. Adrian's adaptive immunity remembered the antigens from the virus and gave him lifelong immunity to it.
E. Adrian's adaptive immunity produced a higher amount of specific antibodies for the antigen, preventing the virus.