The specific immune (defense mechanisms) response can be broadly classified into two types:
a) Cell mediated immune response: This is achieved through large number of activated lymphocytes that are specially designed to destroy foreign agents e.g. the T lymphocytes produced by the thymus.
b) Humoral immune response: The body develops circulating antibodies which are globulin molecules that are capable of attacking the invading agents. B lymphocytes are produced by lymphoid tissue.