What should I tell a patient with a positive MRSA swab?

What to Tell a Patient with a Positive MRSA Swab

A positive MRSA swab indicates you are colonized (carrying the bacteria) but not necessarily infected, and colonization alone does not require antibiotic treatment unless you develop signs of active infection. 1, 2

Understanding Colonization vs. Infection

• Colonization means MRSA bacteria are present on your skin or in your nose/throat but are not causing illness or symptoms. 2
• Approximately 25-30% of healthy people carry Staphylococcus aureus in their nose, and a smaller percentage carry MRSA without any problems. 1
• You should NOT receive antibiotics for colonization alone, as this provides no benefit and increases antibiotic resistance. 2
• Treatment is only indicated when you develop actual signs of infection such as redness, warmth, swelling, pus, fever, or pain at a specific site. 1, 2

What This Means for Your Risk

• If you have a positive MRSA nasal swab, you have a 70-86% chance of having MRSA (rather than regular staph) if you develop a skin infection. 3, 4
• Conversely, a negative MRSA swab means you have only an 8% chance of MRSA infection if you develop a skin problem. 3
• Over 60% of patients colonized with MRSA who undergo surgery or have wounds may develop an actual MRSA infection. 5
• Your colonization status is particularly important if you require surgery, have chronic wounds, diabetes, or are immunocompromised. 1

Preventing Transmission to Others

• Practice meticulous hand hygiene by washing hands with soap and water for at least 20 seconds, especially after touching your nose, before eating, and after using the bathroom. 1
• Do not share personal items such as towels, razors, clothing, or athletic equipment with others. 2
• Cover any cuts, scrapes, or wounds with clean, dry bandages until healed. 1
• Clean and disinfect frequently touched surfaces in your home (doorknobs, light switches, countertops) regularly. 1
• You do not need to isolate yourself from family members, but these precautions reduce transmission risk. 1

When Decolonization May Be Recommended

• Decolonization (treatment to eliminate MRSA carriage) is recommended if you have recurrent MRSA infections, are undergoing certain surgeries, or live with someone who has recurrent infections. 1
• The standard decolonization regimen includes intranasal mupirocin ointment twice daily for 5-10 days plus daily chlorhexidine body washes or dilute bleach baths for 5-14 days. 1
• Decolonization is NOT routinely recommended for a single positive swab without recurrent infections or upcoming surgery. 2
• Success rates for decolonization vary, and recolonization can occur, so this is reserved for specific high-risk situations. 1

If You Develop Signs of Infection

• Seek medical attention immediately if you develop increasing redness, warmth, swelling, pus drainage, fever, or worsening pain. 6
• Inform your healthcare provider about your positive MRSA status so they can prescribe appropriate antibiotics. 1, 7
• MRSA requires different antibiotics than regular staph infections—common antibiotics like cephalexin or amoxicillin will NOT work. 2
• Appropriate oral antibiotics for MRSA skin infections include trimethoprim-sulfamethoxazole, doxycycline, or clindamycin. 7, 2

Healthcare Facility Considerations

• Always inform healthcare workers about your MRSA status when admitted to hospitals or undergoing procedures. 1
• You may be placed on contact precautions in healthcare settings, meaning staff will wear gowns and gloves when caring for you. 1
• This is to protect other vulnerable patients, not because you are dangerous to healthy people in the community. 1
• If you require surgery, you may receive special preoperative antibiotics (vancomycin) and decolonization protocols to reduce infection risk. 1

Common Pitfalls to Avoid

• Do not demand antibiotics for colonization alone—this causes harm without benefit. 2
• Do not stop practicing good hygiene once you've been told you're colonized, as you can still transmit MRSA to others. 1
• Do not assume all future infections will be MRSA—wound cultures should still be obtained to guide treatment. 1, 8
• If prescribed decolonization, complete the entire regimen even if you feel fine, as incomplete treatment may fail. 1