What is natural active acquired immunity?

• A. Immunity gained through vaccination
• B. Immunity developed through antibody transfer from mother to child
• C. Immunity established by the body's plasma cells responding to a microbially-induced illness
• D. Immunity conferred by animal antibodies

Answer: (C)

Natural active acquired immunity refers to the immune response that occurs when the immune system is exposed to a pathogen, such as through an infection, and subsequently produces its own antibodies. This process results in the formation of memory cells that can recognize and respond more rapidly to future infections by the same pathogen.

In the context of the correct answer, the body’s plasma cells are activated in response to a microbially-induced illness, leading to the production of a specific immune response tailored to that pathogen. This response not only helps in clearing the infection but also contributes to long-term immunity.

The other options describe different types of immunity. Vaccination represents artificially induced immunity, while the transfer of antibodies from mother to child is an example of passive immunity, which does not involve the child's immune system actively producing antibodies. Immunity conferred by animal antibodies also falls under passive immunity, as it involves receiving pre-formed antibodies from another species, rather than an active immune response from the individual itself.