Patient #21, a 69 year-old male with a history of ischemic heart disease and non-insulin-dependent diabetes mellitus. He was admitted in November 2019 with malignant otitis and mastoiditis on his left ear due to Pseudomonas aeruginosa. The patient was discharged on Dec 1st and readmitted with the same issue on Dec 8th suggesting failure on antibiotics. On Dec 19th, he had a left radical mastoidectomy. Antibiotics were started postoperatively and phages were added 2 days later. Phages were given intravenously for 2 weeks and ceftazidime was administered for 6 weeks. No adverse events were observed during therapy and his treatment provided a good response. During a follow visit on 26Jan2020 he was noted to have good closure of the surgical wound.