Immunity acquired due to the injection of immunologically competent lymphocytes is termed as –
**Core Concept**
Acquired immunity generated by transferring immunologically competent lymphocytes is a form of adoptive immunity. This process involves the transfer of immune cells, such as T cells or B cells, from one individual to another, imparting specific immune responses to the recipient.
**Why the Correct Answer is Right**
Adoptive immunity, specifically cell-mediated immunity, is primarily mediated by T cells. When immunologically competent lymphocytes, including T cells, are injected into a recipient, they recognize and respond to antigens, thereby inducing an immune response. This process is crucial in the treatment of certain cancers and immunodeficiency disorders. The transferred T cells can proliferate and differentiate into effector cells, such as cytotoxic T cells, which recognize and eliminate infected cells or tumor cells.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a recognized term for the immunity type described in the question.
**Option B:** This option is incorrect because it refers to a different type of immunity, where the immune response is generated by the recipient's own cells rather than transferred immune cells.
**Option C:** This option is incorrect because it refers to a different type of immunity, where the immune response is generated by the recipient's own cells in response to a pathogen or antigen.
**Clinical Pearl / High-Yield Fact**
It is essential to note that adoptive immunity can be used to treat various conditions, including leukemia and lymphoma, by transferring T cells that are specifically designed to target cancer cells.
**Correct Answer:** C. Cell-mediated immunity