Bacterial endocarditis is an infection of the inner lining of the heart and the associated internal heart structures, such as the heart valves. This infection can occur in any person (infant, child or adult) who has heart disease present at birth (congenital heart disease), or can occur in people without heart disease.

Bacterial endocarditis does not occur very often, but when it does, it can cause serious heart damage. It is very important to prevent this infection from occurring, if possible.