Prosthetic Tricuspid Valve Endocarditis Caused by Pseudoxanthomonas kaohsiungensis

Abstract Infective endocarditis is a sequelae of bloodstream infection by bacteria/fungi leading to seeding of the endocardium and/or cardiac valves. Gram-positive organisms such as staphylococci and streptococci are the most common causative species. New pathogens causing endocarditis continue to be identified. We present a rare case of prosthetic tricuspid valve endocarditis caused by Pseudoxanthomonas kaohsiungensis . The individual described appeared to have several risks predisposing to the infection and the specific causative organism. Identification of the pathogen and planning therapy were challenging given scarcity of information about the bacteria and its unusual antimicrobial resistance pattern.