Immunity that is a result of the body developing the ability to defend itself against a specific agent, as a result of having had the disease or from having received an immunization against a disease.
Masses of lymphatic tissue located near the opening of the nasal cavity into the pharynx; also called the pharyngeal tonsils.
An abnormal condition charaterized by an excessive reaction to a particular stimulus.
immune reaction (immune response)
A defense function of the body that produces antibodies to destroy invading antigens and malignancies.
The state of being resistant to or protected from a disease. The individaul is said to be "immune".
The study of the reaction of tissues of the immune system of the body to antigenic stimulation.
A special treatment of allergic responses that administers increasingly large doses of the offending allergens to gradually develop immunity.
Interstitial fluid picked up by the lymphatic capillaries and eventually returned to the blood. Once the intersititial fluid enters the lymphatic vessels, it is known as lymph.
Any disorder of the lymph nodes or lymph vessels, characterized by localized or generalized enlargement.
Small, agranulcytic leukocytes originating from fetal stem cells and developing in the bone marrow.
Any phagocytic cell involved in the defense against infection and in the desposal of the products of the breakdown of cells. Macrophages are found in the lymph nodes, liver, spleen, lungs, brain, and spinal cord.
A state fo having a lack of resistance to pathogens and other harmful agents. For example, the individual is said to be "susceptible".
Cells important to the immune response, They mature in the thymus. Upon maturation, the T cells enter the blood and circulate thoughout the body, providing defense against disease by attacking foreign and/or abnormal cells.