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Despite advances in diagnosis and treatment, bacterial endocarditis continues to have high mortality and morbidity. Bacterial endocarditis involving prosthetic heart valves is a particularly severe and increasingly frequent problem. This may be related to several factors, including the increasing proliferation of prosthetic heart valves, longer survival of recipients and improved laboratory techniques for isolation and identification of bacteria. Staphylococcus aureus and other gram-positive organisins are the commonest cause of prosthetic valve endocarditis, but gram-negative organisms have also been implicated." 2 We report on a patient with bacterial endocarditis caused by Kingella kingae, a gram-negative coccobacillus that has been a rare cause of bacterial endocarditis.