Available data indicate that in the early stage of the disease, most patients have a normal or decreased leukocyte count with lymphocytopenia (due to a decreased immune response to virus); unchanged/increased monocyte count; increased activity of lactate dehydrogenase (LDH) – as a marker of pulmonary injury, aminotransferase (AST) or alanine aminotransferase (ALT) above the upper limit of the reference range (indicators of liver injury and/or widespread organ damage) (12, 35). The gene discussed is GPT; the disease is lymphopenia.