On the seventh day after the operation, the patient was diagnosed with the new coronavirus infection. On the fifth day from the onset of the viral disease and on the 12th day after the operation, the signs of a “cytokine storm” were appeared, the volume of lung damage increased from 6 to 50 %, and the phenomena of respiratory failure increased. Immunosuppressive therapy (high doses of glucocorticoids, interleukin blockers) was prescribed. The condition was stabilized. On the 20th day after the operation and the 13th day from the start of the diagnosis of the new coronavirus infection, there were signs of peritonitis, which required laparoscopic sanitation and drainage of the abdominal cavity for widespread serous peritonitis without a primary focus. On the 26th day after hemicolectomy and the 19th day from the onset of coronavirus infection, the extraperitoneal opening of the retroperitoneal phlegmon on the left was performed. On the 61st day after hemicolectomy and the 68th day from the onset of coronavirus infection, the extraperitoneal opening of the phlegmon of the retroperitoneal space on the right was performed. On the 78th day, he was discharged from the hospital in a satisfactory condition.