A 65-year-old man with a prosthetic aortic valve presents with fever, malaise and a new systolic murmur. Infective endocarditis is suspected. What is the most appropriate next diagnostic step before starting empiric antibiotics?APerform transoesophageal echocardiography immediately before any blood testsBObtain at least two (preferably three) sets of blood cultures from different sitesCStart empiric antibiotics immediately, then take blood cultures laterDOrder a CT coronary angiogramEPerform a single random blood culture onlyCheck my answer