Methicillin-resistant Staphylococcus aureus

Microorganisms resistant to specific antibiotics

Micro-resistant Staphylococcus aureus

Methicillin - reactive Staphylococcus aureus

NHM MP Staff Nurse - 2015

Microbiology

Easy

MRSA stands for -

Appeared in: NHM MP Staff Nurse - 2015

Explanation

MRSA is the acronym for Methicillin-resistant Staphylococcus aureus.
This identifies a specific strain of Staphylococcus aureus bacteria.
The key characteristic of this strain is its resistance to methicillin, a type of penicillin, and other related beta-lactam antibiotics.
This resistance is mediated by the mecA gene, which alters the antibiotic's target site (penicillin-binding protein) in the bacterial cell wall.

Option B: This is a broad, general definition of antibiotic resistance, not the specific name of an organism. MRSA is a specific type of microorganism, not a general category.
Option C: The term "Micro-resistant" is not a standard medical prefix or term used in microbiology. It is a fabricated distractor.
Option D: The word "reactive" is the opposite of "resistant." It incorrectly suggests that the bacteria are affected by methicillin, when in fact, they are not.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The definition and full form of the acronym MRSA (Methicillin-resistant Staphylococcus aureus) as background academic context rather than a clinical decision trigger.
Nurses are at the forefront of infection control. Correctly identifying and understanding MRSA is fundamental to implementing appropriate contact precautions and preventing nosocomial (hospital-acquired) infections.
Patient education is a key nursing role. Nurses must explain to patients and families why isolation and other precautions are necessary to prevent the spread of MRSA to others in the hospital and community.
What if? If a patient is colonized with MRSA (carries the bacteria without signs of infection) but is admitted for an unrelated condition, the nurse must still implement full contact precautions because the patient can still transmit the bacteria to others, even without being actively infected.

How to Approach the Question

This is a factual recall question testing your knowledge of a common medical acronym.
First, read the acronym 'MRSA' and try to recall its full name.
Analyze each option carefully. The correct answer will be the precise, medically accepted term.
Use the process of elimination. Option B is too general. Option C uses a non-standard term ('Micro-resistant'). Option D uses 'reactive,' which is the opposite of the resistance implied by the 'R' in MRSA.
Confirm that 'Methicillin-resistant Staphylococcus aureus' correctly expands the acronym and makes sense in a medical context.

Concept Tested & Keywords

Concept Tested: The definition and full form of the acronym MRSA (Methicillin-resistant Staphylococcus aureus).
Stem keywords: MRSA, stands for
Lead-in keywords: stands for

QXD7ERD6g6laXc4rA471JC

E6 Microbiology Essentials Sastry 4e Part 2 p. 70-72

E6 Medicine Harrison 22e Part 1 pp. 1245-1247, 1068-1070

Practise the full NHM MP Staff Nurse - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.