MRSA (Methicillin-Resistant Staphylococcus aureus)

A species of Gram-positive bacterium. This strain of S. aureus is resistant to methicillin and other beta-lactam antibiotics.

PubMed Health Glossary
(Source: NIH - National Cancer Institute)

Methicillin-Resistant Staphylococcus aureus (MRSA) Ingestion by a Neutrophil Click to enlarge

MRSA bacteria (purple) being absorbed by a human neutrophil (immune cell) National Institutes of Health

About MRSA

MRSA is methicillin-resistant Staphylococcus aureus, a type of staph bacteria that is resistant to several antibiotics. In the general community, MRSA most often causes skin infections. In some cases, it causes pneumonia (lung infection) and other issues.

If left untreated, MRSA infections can become severe and cause sepsis--a life-threatening reaction to severe infection in the body.

In a healthcare setting, such as a hospital or nursing home, MRSA can cause severe problems such as bloodstream infections, pneumonia and surgical site infections....Read more about MRSA CDC - Centers for Disease Control and Prevention

Terms to know

Gram Stain
This is a method (named after the Danish bacteriologist, Hans Christian Gram) for staining and identifying bacteria.
Gram-positive Bacteria
Infections caused by bacteria that retain the crystal violet stain (positive) when treated by the gram-staining method.
Neutrophils
A type of immune cell that is one of the first cell types to travel to the site of an infection. Neutrophils help fight infection by ingesting microorganisms and releasing enzymes that kill the microorganisms. A neutrophil is a type of white blood cell, a type of granulocyte, and a type of phagocyte.
Pneumonia
Pneumonia is an infection in one or both of the lungs. Many germs—such as bacteria, viruses, and fungi—can cause pneumonia.
Sepsis
Disease caused by the spread of bacteria or toxins in the bloodstream.

Terms to know

Gram Stain
This is a method (named after the Danish bacteriologist, Hans Christian Gram) for staining and identifying ba...
Gram-positive Bacteria
Infections caused by bacteria that retain the crystal violet stain (positive) when treated by the gram-staini...
Neutrophils
A type of immune cell that is one of the first cell types to travel to the site of an infection. Neutrophils...
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