Alveolitis exogenous allergic (a hypersensitive pneumonitis, inhalation pneumopathies, a lung of poultry breeders, a lung of the farmer, etc.) - pathological process in the lungs, arising in reply to the known causal factor - allergen (an organic or inorganic dust, mushrooms, bacteria, etc.) and expressed allergic reaction. Features of response of a macroorganism matter both antigenic structure of causal factors, and.

Pathogenesis. Hydrolytic enzymes of alveolar macrophages cause splitting a complement with formation of various fractions and in the subsequent conduct to formation of a component which through alternative ways leads to greater intensity of disintegration of fractions; activation of production of immunoglobulins by lymphocytes conducts to formation of immune complexes which in the further are postponed on a basal membrane of vessels of lungs and at bracing on their surface of a complement become phagocytes accessible to absorption.