Immunology

Step 1: Statement I is incorrect. Immunity developed due to vaccination is called artificial active acquired immunity, not passive immunity. Passive immunity involves the transfer of pre-formed antibodies (e.g., from mother to child), whereas active immunity is induced by vaccination where the individual’s immune system produces antibodies.
Step 2: Statement II is correct. Interleukins are indeed involved in the differentiation and activation of immune cells. They are signaling molecules that help coordinate immune responses.
Step 3: Statement III is incorrect. Large granular lymphocytes, such as Natural Killer (NK) cells, destroy infected cells in an antibody-independent manner. They do not require antibodies to recognize and kill infected cells; they recognize abnormal cells through various receptors.
Step 4: Statement IV is correct. Mature lymphocytes do transform into functional lymphocytes in structures such as Peyer's patches. These lymphoid tissues are located in the intestines and play a critical role in the immune system, especially in the mucosal immunity.
Conclusion: The incorrect statements are I and III, making (1) I, III the correct answer.

To solve the problem, we need to identify the cells involved in cell-mediated immunity.

1. Understanding Cell-Mediated Immunity:
Cell-mediated immunity involves T-cells, which are a type of white blood cell that helps in fighting infections and regulating immune responses. T-cells do not produce antibodies like B-cells but instead directly attack infected cells or help in activating other immune cells.

2. Analyzing the Options:
T-cells (Option 1): T-cells are indeed involved in cell-mediated immunity. They are essential for recognizing and responding to infected or cancerous cells.
B-cells (Option 2): B-cells are involved in humoral immunity, which involves the production of antibodies, not in cell-mediated immunity.
Interferons (Option 3): Interferons are signaling proteins that help in immune responses, especially in antiviral defense, but they are not directly responsible for cell-mediated immunity.
Interleukins (Option 4): Interleukins are cytokines that help in communication between immune cells, but they are not the primary players in cell-mediated immunity, although they can aid in T-cell function.

3. Conclusion:
Based on the understanding of cell-mediated immunity, the correct answer is:

Final Answer:
The correct option is (A) T-cells.