What is the recommended decolonization protocol for a patient colonized with Staphylococcus aureus (S. aureus), particularly for those with a history of recurrent staph infections or healthcare workers at risk of transmission?

Staphylococcus aureus Decolonization Protocol

When to Consider Decolonization

Decolonization should only be implemented after optimizing hygiene measures have failed, specifically for patients with recurrent skin and soft tissue infections (≥2 episodes in 6 months) or when ongoing household transmission persists despite hygiene interventions. 1

Do NOT routinely decolonize:

• Asymptomatic carriers without recurrent infections 2
• Patients who have not first attempted hygiene optimization 3
• As a first-line intervention 3

DO consider decolonization when:

• Recurrent SSTI occurs despite optimized wound care and hygiene measures 1
• Ongoing transmission among household members continues despite hygiene interventions 1
• Pre-operative screening identifies colonization before high-risk surgery (cardiac, orthopedic) 1, 2

Step 1: Optimize Hygiene Measures FIRST (Before Any Decolonization)

All patients must implement these measures before considering decolonization: 1

Personal hygiene:

• Keep draining wounds covered with clean, dry bandages at all times 1
• Hand hygiene with soap and water or alcohol-based gel after touching infected skin or contaminated items 1
• Avoid sharing personal items (razors, linens, towels) that contact skin 1
• Regular bathing 1

Environmental hygiene:

• Focus cleaning on high-touch surfaces (counters, doorknobs, bathtubs, toilet seats) 1
• Use commercially available cleaners according to label instructions 1

Step 2: Decolonization Protocol (Only After Step 1 Fails)

The recommended decolonization regimen combines nasal and body decolonization: 1, 2

Nasal decolonization:

• Mupirocin 2% ointment applied to both anterior nares twice daily for 5-10 days 1, 2
• Mupirocin remains the gold standard with the most extensive evidence base 2, 4

Body decolonization (choose one):

• Chlorhexidine gluconate 4% soap for daily full-body washing for 5-14 days 1, 2
• OR dilute bleach baths: 1 teaspoon per gallon of water (or ¼ cup per ¼ tub/13 gallons) for 15 minutes twice weekly for 3 months 1

Critical point: Decolonization strategies must be offered in conjunction with ongoing reinforcement of hygiene measures, not as a replacement. 1, 2

Pre-Operative Decolonization (Strongest Evidence)

For patients undergoing cardiac or orthopedic surgery with documented S. aureus colonization: 1

• Start decolonization at least 48 hours before surgery 1
• Continue for total duration of 5-7 days 1
• Combine mupirocin with twice-daily chlorhexidine mouthwash for oropharyngeal decontamination 1
• This reduces postoperative S. aureus infections by 45% (RR 0.55) 1
• Pre-operative decolonization has the strongest evidence base for reducing surgical site infections 1, 4

Household Contact Management

For symptomatic contacts:

• Evaluate and treat for possible MRSA infection 1
• Consider decolonization after treating active infection 1, 2

For asymptomatic household contacts:

• Consider decolonization only if ongoing transmission within household persists 1, 2

Role of Cultures

Screening cultures are NOT routinely recommended in most situations: 1, 2

• Do NOT obtain screening cultures prior to decolonization if at least one prior infection was documented as MRSA 1, 2
• Do NOT obtain surveillance cultures following decolonization in the absence of active infection 1, 2

Critical Pitfalls and Caveats

Evidence limitations:

• The evidence supporting decolonization for community-acquired MRSA is weak (C-III level evidence) 1
• Most studies showing benefit were conducted in healthcare settings or with MSSA, not community-acquired MRSA 3
• No published data support efficacy specifically for preventing recurrent community-acquired MRSA SSTI 1

When decolonization may fail:

• Local factors present: foreign material, hidradenitis suppurativa, pilonidal cysts must be addressed first 2, 3
• Neutrophil dysfunction in patients with recurrent abscesses in early childhood 2
• Recolonization occurs in 40-60% of patients within 3 months after decolonization 2

Resistance concerns:

• Monitor local mupirocin resistance patterns 2
• Rising mupirocin resistance is a concern with repeated use 4, 5

Pediatric considerations:

• Hexachlorophane should NOT be used in children under 2 months of age due to neurological complications risk 2
• Tetracyclines should NOT be used in children <8 years of age 1
• Mupirocin 2% topical ointment can be used for minor skin infections in children 1, 2

Adjunctive Antibiotic Therapy

For recurrent abscesses specifically: 3

• Consider a 5-10 day course of an antibiotic active against the pathogen after obtaining cultures 3
• The benefits of adjunctive antimicrobial therapy in preventing recurrences remain uncertain 2, 3

Healthcare Worker Decolonization

Universal screening and decolonization of healthcare workers is generally the least effective intervention as a stand-alone strategy, especially in high-endemicity settings. 6

• Only consider if few persistently colonized healthcare workers are responsible for a large fraction of MRSA acquisitions 6
• Patient decolonization is more effective than healthcare worker decolonization and outperforms patient isolation 6