PSVI-26 Cytological picture of the lymphoid tissue in the inguinal node with calval leptospirose

In this regard, the cytological picture of the lymphoid tissue in calves’ inguinal lymph node with spontaneous leptospirosis was studied. The study material was taken from the inguinal lymph node of the 11 calves who died of leptospirosis during the enzootic period in Azerbaijan. The study material samples were fixed in 10% neutral formalin solution, followed by pouring in paraffin, coloring azur sections with 2-eosin and counting 13 cell types (lymphoblast, prolymphocyte, lymphocyte, free reticular cell, process sinus reticular cell, endothelium, fibroblast, histiocyte, macrophage, polyblast, plasmablast, protoplasmocyte, plasmacyte) using MOV-15. It was established that the number of lymphoblasts in the inguinal lymph node with subacute leptospirosis decreased 2.2 times, the number of prolymphocytes decreased 1.4 times, the number of lymphocytes decreased 4.4 times. The number of free reticular cells from the cells of the reticuloendothelium decreased 3.7 times. However, the number of grown sinus reticular cells and the endothelium of the sinuses fluctuated within the normal range. The number of fibroblasts increased 1.7 times, histiocytes - 6.6 times, macrophages - 11.8 times, and polyblasts - 11 times (Table 1). At the same time, there was a sharp increase in the number of cells in the plasma row. Of those, the number of plasmablasts increased 8.5 times, protoplasmocytes - 30.4 times, plasma cells - 17 times. Overall, the cytological picture in the inguinal lymph node during spontaneous leptospirosis in calves was characterized by an increase in the number of plasma cells, fibroblasts, histiocytes, macrophages, polyblasts and a decrease in the number of lymphoblasts, prolymphocytes, lymphocytes and free reticular cells.