The principle of Vaccination and Immunization is based on which property of the immune system?

Interferons protect non-infected cells from further viral infection. These are included in which of the following barriers of innate immunity?

Given below are two statements:
Statement $I:$ Autoimmune disorder is a condition where the body's defense mechanism recognizes its own cells as foreign bodies.
Statement $II:$ Rheumatoid arthritis is a condition where the body does not attack self-cells.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which types of cells are produced during the clonal selection of $B$-cells?

Innate immunity is defined as.........

Which of the following acts as a physical barrier to prevent the entry of microorganisms into our body?