Clinical Microbiology and Antimicrobial Chemotherapy. 2023; 25(1):100-105
A rare clinical case of native aortic valve infective endocarditis (IE) caused by Klebsiella pneumoniae in a 56-year old man without known risk factors predisposing to the development of IE is presented. Diagnosis of IE in this patient was a challenge due to the lack of recent interventions that could be considered as a source of bacteremia, scarce clinical manifestation and absence of typical complications. Aortic valve vegetation was detected by transesophageal echocardiography. K. pneumoniae isolate was susceptible to all antibiotics tested. Antibacterial therapy (cefepime 6 g/day IV for 2 weeks in the hospital followed by ceftriaxone 4 g/day IM and cefixime 400 mg/day PO, a total of 4 weeks as an outpatient) resulted in a complete resolution of IE signs and symptoms, laboratory abnormalities as well as vegetation size decrease. Surgical treatment was not required in this patient.