Most people with
endocarditis have symptoms that begin within 2 weeks
after becoming infected. Vague, flu-like symptoms, such as a low-grade fever
and fatigue, often occur first. But infection with a powerful strain of
bacteria may cause symptoms to be more severe (such as a high fever) and to
appear much faster, within a few days. If symptoms persist, see your doctor,
especially if you are at a high risk for endocarditis.