Damage to thymus in a child may lead to :

The thymus is a critical organ in the immune system, particularly during childhood and adolescence, where it plays a key role in the development and maturation of T lymphocytes (T cells). T cells are essential for cell-mediated immunity, which is a type of immune response that involves the activation of immune cells, such as T cells and macrophages, to defend against infections and foreign substances. Damage to the thymus in a child can lead to a deficiency in T cell production and function, resulting in a compromised cell-mediated immune response. This makes the individual more susceptible to certain infections and diseases. Therefore, the correct answer is option (D) loss of cell mediated immunity. Think of it this way: the thymus is essential for the development of T cells, which are crucial for cell-mediated immunity, and damage to the thymus can impair this aspect of the immune response.