Abstract
The incidence of anaerobic bacteremia has been increasing over the past several decades. Further, antibiotic resistance in Bacteroides is a pertinent issue. A 76-year-old man was brought to our hospital with complaints of fever, chills, and abdominal pain. Empiric antibiotics induced minimal relief. The blood culture was positive for multi-drug resistant Bacteroides ovatus. Our patient developed a periaortic abscess in the abdominal aorta and a thoracic aortic aneurysm with ulcer-like projection (ULP), which rapidly increased in size. He was transferred to the tertiary medical institution for surgical drainage. This case suggests that bacteremia can exacerbate aneurysms with ulcerative lesions. Anaerobic bacteremia is a possible differential diagnosis when periaortic abscess formation is present. Early surgical consultation and appropriate antibiotic selection are crucial in anaerobic bacteremia treatment.
Highlights
As the infection becomes severe or the host immune system is deterred, the anaerobes can invade into the blood stream, causing blood stream infection as a form of bacteremia [1]
We experienced the deterioration of aortic aneurysm caused by multi-drug resistant Bacteroides ovatus blood stream infections accompanying periaortic abscess formation
Our patient developed a periaortic abscess in the abdominal aorta and a thoracic aneurysm (TAA), which rapidly increased in size
Summary
Bacteroides ovatus, one of the related strains of the Bacteroides genus, which constitutes 30% of the total colonic bacteria, is known as an anaerobic microbe that causes abscess formation in most anatomical sites [8]. In this case, we experienced the deterioration of aortic aneurysm caused by multi-drug resistant Bacteroides ovatus blood stream infections accompanying periaortic abscess formation. We experienced the deterioration of aortic aneurysm caused by multi-drug resistant Bacteroides ovatus blood stream infections accompanying periaortic abscess formation The purpose of this case report was to show the importance of considering antibiotic resistance in Bacteroides and predicting the exacerbation of existing diseases such as aortic aneurysm.
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