A young gentleman, with background history of asthma, alcohol escess, an active intravenous drug users, with poor social situation, was admitted through casualty due to few days history of intermittent fever and rigors, with night sweats, general unwell, and lethargy. On further questioning, he denied any chest pain, shortness of breath, headache, productive cough or urinary system. He did had a few episodes of rigors for the last 3 days, with fever. Temperature was 38 celcium on arrival. No signs of cellulitis, and his injection sites looked clean. On examinatiom, there was a soft systolic mumur. His CRP was around 200, with raised white cell count and neutrophi. What is your differential diagnosed ? What investigations should be done? What treatment should be offered ??