MRSA

Definition

MRSA (Methicillin-resistant Staphylococcus aureus) is a type of Gram-positive bacterium that is resistant to several widely used antibiotics, making it difficult to treat. It commonly causes skin and soft tissue infections but can lead to more severe invasive diseases.

5 Must Know Facts For Your Next Test

1. MRSA is resistant to methicillin and other beta-lactam antibiotics due to the mecA gene.
2. It is often identified through staining and culture techniques in microbiology labs.
3. MRSA can be transmitted through direct contact with an infected wound or by sharing personal items that have touched infected skin.
4. Vancomycin is one of the primary antibiotics used to treat MRSA infections.
5. Healthcare-associated MRSA (HA-MRSA) occurs in medical settings, while community-associated MRSA (CA-MRSA) occurs outside healthcare environments.

Review Questions

• What genetic component gives MRSA its resistance to methicillin?
• How can MRSA be transmitted from one person to another?
• Which antibiotic is commonly used to treat MRSA infections?

Related terms

Staphylococcus aureus:

A common bacterium found on the skin and in the respiratory tract that can cause a range of illnesses.

Gram-Positive Bacteria: Bacteria that have a thick peptidoglycan cell wall which retains the crystal violet stain used in Gram staining.

Vancomycin:

An antibiotic used as a treatment for serious bacterial infections, especially those caused by Gram-positive bacteria like MRSA.