Differential Diagnostics of Etiology of Acute Infections

Inclusion Criteria: * neuroinfections or acute intestinal infections; * the possibility of blood sampling within a period of up to 24 hours from the moment of admission to hospital; * less than 72 hours passed after the onset of the disease and until blood was collected; Exclusion Criteria: * refuse of patient to participate in the trial; * more than 24 hours passed after the patient entered the hospital; * the disease began more than 72 hours ago; * concomitant severe acute and chronic diseases; * malignant neoplasms, treatment at a time of less than 1 year, autoimmune diseases in the phase of exacerbation; * pregnancy/lactation; * HIV, Hepatites B/C; * active tuberculosis; * alcohol use disorder/drug addiction.