Immunopathology is a branch of medicine that deals with immune responses associated with disease. It includes the study of the pathology of an organism

Organism

In biology, an organism is any contiguous living system . In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homoeostasis as a stable whole.An organism may either be unicellular or, as in the case of humans, comprise...

, organ system, or disease with respect to the immune system

Immune system

An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and killing pathogens and tumor cells. It detects a wide variety of agents, from viruses to parasitic worms, and needs to distinguish them from the organism's own...

, immunity, and immune responses.

It is a subspecialty of Clinical Pathology

Clinical pathology

Clinical pathology , Laboratory Medicine , Clinical analysis or Clinical/Medical Biology , is a medical specialty that is concerned with the diagnosis of disease based on the laboratory analysis of bodily fluids, such as...

which consists in analysis of body fluids for detection of immune system diseases.

(Source : Medline Plus : Medical Dictionary)

In biology, it refers to damage caused to an organism by its own immune response, as a result of an infection.