A 74-year-old man, with a permanent pacemaker placed 2 years ago for high-grade atrioventricular block, was admitted for worsening fatigue, confusion, and thrombocytopenic purpura without fever. White blood cell count and C-reactive protein were elevated, and echocardiography revealed a 6 × 3-cm echogenic mass surrounding the pacemaker leads. Multiple blood cultures were performed, and only 1 bottle grew Propionibacterium acnes at 93 hours. The patient underwent surgery, and 16S rRNA gene polymerase chain reaction amplification confirmed the presence of P. acnes in the removed vegetation. Patients with late-onset, device-related endocarditis often present with vague symptoms and fever may be absent, obscuring the clinical diagnosis. Blood cultures and transesophageal echocardiography are key diagnostic tests. As a slow-growing, low virulent, and common human skin germ, P. acnes can be wrongly considered as a blood culture contaminant.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.