Final answer:
The most common symptom of infective endocarditis is fever.
Step-by-step explanation:
The most common symptom of infective endocarditis is fever. Infective endocarditis is an infection of the lining of the heart and heart valves. When bacteria enter the bloodstream and attach to damaged heart valves or artificial heart valves, it can cause an infection in the heart, leading to symptoms such as fever, fatigue, chills, sweating, and flu-like symptoms. It is important to seek medical attention if you experience any of these symptoms as infective endocarditis can be a serious condition that requires prompt treatment.