30th July 2020

A 52-year-old man has been admitted into hospital with progressive shortness of breath and pyrexia of unknown origin

A 52-year-old man is admitted to hospital with progressive shortness of breath and pyrexia of unknown origin. He is currently haemodynamically stable. A series of blood cultures are carried out, and together with the findings on echocardiogram, a formal diagnosis of infective endocarditis is made. He has had no previous cardiac problems, no history of valve replacement, no congenital heart disease or rheumatic fever. He has had no recent admissions to hospital. 

For the patient above, please select the SINGLE most likely organism. Select ONE option from the list above.