Alloscardovia omnicolens, an unusual pathogen causing bacteremia: a case report and literature review.

Background: Bloodstream infections by Alloscardovia omnicolens are extremely rare, most of the bacteremia cases reported to date have been found in immunocompromised patients and were secondary to urinary tract infections.Case presentation: An 82-year-old male presented to the emergency department with jaundice, generalized pruritus and choluria.He had several comorbidities including diabetes mellitus, chronic kidney disease, dyslipidemia, chronic obstructive pulmonary disease, and cardiac insufficiency.Laboratory findings showed altered liver function and a cholangiopancreatography revealed findings suggestive of cholangiocarcinoma.During admission the patient developed fever and blood cultures were performed.Alloscardovia omnicolens, a facultative anaerobic gram-positive rod belonging to the family Bifidobacteriaceae, grew on aerobic bottles of two blood culture sets.The patient was treated with piperacillin-tazobactam for two weeks and died four weeks after admission.Conclusion: This case highlights the importance of early recognition and effective management of this rare complication caused by this microorganism.