Relapsing Bacillus licheniformis peritonitis in a continuous ambulatory peritoneal dialysis patient

Bacillus licheniformis is a rare pathogen in continuous ambulatory peritoneal dialysis (CAPD) peritonitis. Only one case of B. licheniformis peritonitis has been previously reported but relapsing peritonitis by same species has not been reported. A 31-year-old man undergoing CAPD was admitted to our hospital with diarrhoea and turbid peritoneal effluent. Although B. licheniformis was cultured at his previous admission, we did not consider the species as a pathogen. After the same species was cultured twice consecutively at the subsequent admission, we confirmed that B. licheniformis was a pathogen of CAPD peritonitis. After appropriate intraperitoneal antibiotics therapy, the patient improved. He is currently undergoing CAPD without catheter removal.