A 43-year-old man has undergone a surgery for osteomyelitis of the left thigh. On the 6th day the patient's condition was complicated with sepsis. Despite complex therapy of sepsis on the 9th day the patient persistently presents with temperature up to 40°C, heart rate is 110/min., respiration rate is 23/min., BP is 100/60 mm Hg. Blood test: leukocytes - 16 × 109/l, band neutrophils -16%. What phase of clinical course is it?