Case report: A prosthetic valve endocarditis caused by Legionella bozemanae in an immunocompetent patient

Native Valve Legionella Endocarditis in a 74-Year-Old Male: A Case Report and Review

Legionella is a bacterium that primarily causes respiratory infections. Rarely, it can result in extrapulmonary infections like endocarditis. We present a case of native valve endocarditis caused by Legionella in a 74-year-old male. Our patient initially presented with fever, fatigue, confusion, moderate cough, and dysuria. Subsequent presentation included atrial fibrillation and pulmonary infiltrates on chest X-ray. His clinical sequelae and positive urine Legionella antigen prompted treatment with antibiotics and cardiac medication. Echocardiograms revealed vegetation on the mitral valve leaflet suggestive of endocarditis. The patient improved after appropriate antibiotic and anti-arrhythmic therapy. In presenting this case and literature review, we emphasize the importance of considering atypical pathogens in common clinical presentations.

A Fatal Case of Legionella bozemanii Pneumonia in an Immunocompetent Patient

Legionella bozemanii pneumonia is a rare form of Legionnaires' disease caused by the bacterium Legionella bozemanii. It is well known to cause pneumonia in immunocompromised patients and has rarely been reported in immunocompetent hosts. We describe a case of a 59-year-old immunocompetent female presented with pneumonia, acute respiratory failure, acute respiratory distress, and septic shock, who was treated with azithromycin, goal-directed resuscitation, and extracorporeal membrane oxygenation (ECMO) but did not survive. Clinicians should have high suspicion of rare legionella pathogens as causative agents for pneumonia.

Complete Genome Sequence of Legionella cardiaca Strain H63T, Isolated from a Case of Native Valve Endocarditis

We report the complete genome sequence of Legionella cardiaca strain H63T, which had been isolated from aortic valve tissue from a patient with native endocarditis. The genome assembly contains a single 3,477,232-bp contig, with a G+C content of 38.59%, and is predicted to encode 2,948 proteins.