A patient operated on complicated appendicitis has the following changes of blood count: erythrocytes - 4,0 × 1012/l, Hb - 120 g/l, color index - 0,9, leukocytes - 18 × 109/l, basophils - 0, eosinophils - 0, myelocytes - 0, juvenile - 0, stab neutrophils - 20, segmentonuclear neutrophils - 53, lymphocytes - 21, monocytes - 5. How is such nuclear shift of leukocytic formula called?