Merck Manual

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Enterococcal Infections

By

Larry M. Bush

, MD, FACP, Charles E. Schmidt College of Medicine, Florida Atlantic University

Last full review/revision Jun 2019| Content last modified Jun 2019
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Enterococcal infections are caused by a group of gram-positive bacteria called enterococci, which normally reside in the intestine of healthy people but sometimes cause infection.

(See also Overview of Bacteria.)

There are more than 17 species of enterococci. Many species normally occupy the intestinal tract and do not usually cause disease. These bacteria, called resident flora, cause disease only under certain circumstances—for example, when they enter other parts of the body.

Enterococcus faecalis and Enterococcus faecium are the species that most commonly cause infections in people.

Enterococci typically cause the following:

Symptoms depend on the location of the infection.

Doctors give antibiotics and drain any abscesses. Certain strains of enterococci have become resistant to many antibiotics and can be difficult to treat. Strains that are resistant to vancomycin are particularly problematic.

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