The study of the model of superinvasive opisthorchiasis (SO) in Syrian hamsters and autopsy material obtained from patients with SO, it was shown that during the early period of pulmonary disease, the lungs underwent changes developing on the basis of delayed-type hypersensitivity reactions. In the chronic phase of SO, exudative and predominant productive reactions were revealed leading to the interstitial lung disease, fibrosing alveolitis. In the heart in SO, eosinophilic cell myocarditis was found with subsequent diffuse cardiosclerosis. In the testes, sclerotic processes with atrophy of glandulocytes (Leydig cells) and sustentocytes (Sertoli cells) were detected. The structural changes in the lungs, heart and testes were induced by parasite metabolites, that are deposited in tissues in the form of granules and conglomerates.
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