Damage to thymus in a child may lead to :

Explanation

The thymus is the major gland of our immune system. It is responsible for numerous immune system functions, including the production of T-lymphocytes, a type of white blood cell responsible for cell-mediated immunity. Cell-mediated immunity is a type of defense in which specialized cells carry out protective activities, safeguarding the body against pathogens, including protists and fungi that have entered the host's cells. T-cells and B-cells are the types of lymphocytes that develop from bone marrow cells. Those lymphocytes that migrate to the thymus and differentiate are called T-cells, while those cells that continue to differentiate in the bone marrow are known as B-cells. T-cells are responsible for cell-mediated immunity, whereas B-cells produce antibodies and participate in antibody-mediated immunity.