Society of Diabetic Nephropathy Prevention Journal of Nephropathology 2251-8363 14 1 2025 01 01 Chryseobacterium indologenes peritonitis in automated peritoneal dialysis patient; rare but real e21538 e21538 10.34172/jnp.2025.21538 EN Ana Piedade https://orcid.org/0000-0003-3169-7421 António Inácio https://orcid.org/0000-0002-1221-4298 Beatriz Mendes https://orcid.org/0000-0001-9204-2854 Patricia Domingues https://orcid.org/0000-0001-5500-4293 Patrícia Valério https://orcid.org/0000-0001-7397-0233 Lúcia Parreira José Assunção https://orcid.org/0000-0002-4899-5372 Journal Article 10.34172/jnp.2025.21538 2023 12 20 2024 02 23 Peritonitis is a common and serious complication of peritoneal dialysis (PD), associated with significant morbidity. Most peritoneal dialysis-associated peritonitis (PD peritonitis) is caused by gram-positive bacteria group. Gram-negative bacteria are uncommon but have a poor prognosis, associated with an increased likelihood of catheter loss, hospitalization, and death. Chryseobacterium indologenes is a gram-negative, glucose non-fermenting, aerobic oxidase and catalase positive bacillus. It is a rare cause of PD peritonitis, especially in Europe. We report a case of a 75-year-old man who has under automated peritoneal dialysis for 8 months, presenting with a PD peritonitis caused by C. indologenes. The patient was successfully treated with intraperitoneal ceftazidime therapy without the need to remove the PD catheter. This case shows the importance of considering uncommon causes of PD peritonitis, such as C. indologenes, as well as the importance of home visits to patients on PD with the aim of detecting technique errors.