A 48-year-old male with a history of intravenous drug use presents to the emergency department complaining of a high fever and malaise. He also reports experiencing a new onset of a heart murmur and petechiae. His vitals are BP 110/70, HR 102, RR 20, and Temp 102.2°F. Based on these presenting symptoms, which of the following is the most likely diagnosis?
Stable angina
Infective endocarditis
Heart failure
Pericarditis