What is immunity ? Give an account of cell-mediated immunity.

Explanation

Immune response is the speciic reactivitry induced in a host by an antigentic stimulus. The immune response is of following types.
`ddot` Humoral Antibody Mediated Immunity (AMI)
`ddot` Cell-Mediated Immunity (CMI)
Cell-Mediated Immunity
It is the responsibility of a sub-group of T-cell, called T-cytotoxic cells. An activated T-cytotoxic-cell is specific to a targer cell which has been infected and kills the target cell by a variety of méchanisms. It prevents the completion of life cycle of the pachogen since it depends on an intact host cell. Cell mediated immunity it also invovled in killing of cancer cells. T-cells attack the following
(a) Cells that have become infected by a microorganism most cominonly a virus.
(b) Transplanted organs and tissues.
(c ) Cancer causing cells.
The whole cell is involved in the attack, so this type of immunityis described as cell-mediated immunity. T-cells do not relase antibodies.