Dynamic investigation of several immunologic data and complex morphologic study of the thymus of rats fed for a long time (6 months) by very low doses of herbicide simazine have been carried out. Chronic simazine treatment resulted in the development of the secondary immunodeficient state with the damage of T lymphocytes. The morphologic signs of this process were the disarray in thymus structure (dystrophic changes and intercellular contact break of nurse cells, sclerosis of microvessel walls and stromal elements), severe decrease of the T lymphocyte number in peripheral blood, inhibition of phagocytosis reaction of neutrophils.
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