MRSA Fast Facts

This 2005 scanning electron micrograph (SEM) depicted numerous clumps of methicillin-resistant Staphylococcus aureus bacteria, commonly referred to by the acronym, MRSA; Magnified 9560x.

(CNN)Here is some background information about MRSA.

Methicillin-resistant Staphylococcus aureus (MRSA) bacteria are resistant to all beta-lactam antibiotics such as methicillin, penicillin, oxacillin, and amoxicillin. A MRSA infection can be fatal.
Staphylococcus aureus bacteria are commonly found on the skin and in the noses of healthy people.
Skin infections from staph bacteria are called staph infections; staph bacteria are one of the most common causes of skin infection in the United States.
    Staph bacteria are a common cause of pneumonia, surgical wound and bloodstream infections.
    Most of these infections can be treated without antibiotics.
    Thirty three percent of the population is colonized with staph and approximately one percent is colonized with MRSA. "Colonized" means bacteria is present but doesn't cause infection.
    Types of MRSA Infections: (Source: The Mayo Clinic)
    Most MRSA infections occur in hospitals or other health care settings. These are called hospital-associated or healthcare-associated MRSA infections. (HA-MRSA).
    Risk factors for an HA-MRSA infection include current or recent hospitalization, living in a nursing home or invasive surgery.
    MRSA infections occurring in people who have not been hospitalized or haven't had a medical procedure in the past year and are otherwise healthy are called community-associated MRSA infections (CA-MRSA).
    Risk factors for a CA-MRSA infection include playing contact sports, association with childcare workers or living in crowded conditions.
    Red bumps that look like pimples or boils. They can become painful abscesses that must be surgically drained.
    The infection site can resemble a spider bite.
    The bacteria can cause infections in surgical wounds and can get into the bloodstream and bones.
    MRSA is diagnosed by checking for signs of drug-resistant bacteria in nasal secretions or tissue samples. Tests that can detect staph DNA yield faster results than growing the bacteria in a lab.