Management of Suspected MRSA Skin Infections

Treatment Approach

The Infectious Diseases Society of America recommends incision and drainage as the primary treatment for purulent infections, with antibiotics playing a subsidiary role 1, 3, 4
The American College of Emergency Physicians suggests adding antibiotics to treatment when specific features are present, such as systemic signs, extensive surrounding cellulitis, multiple lesions, immunocompromise, or failed drainage alone 1, 2
Obtaining culture from purulent drainage before starting antibiotics is crucial to confirm MRSA and guide definitive therapy 3, 4

The Infectious Diseases Society of America recommends trimethoprim-sulfamethoxazole (TMP-SMX) 1-2 double-strength tablets (160mg/800mg) twice daily for 7-10 days as the most effective oral option for MRSA coverage 5, 3, 4
Doxycycline 100 mg twice daily for 7-10 days is an alternative when TMP-SMX fails or is contraindicated, as suggested by the American College of Emergency Physicians 1, 2, 3
Clindamycin 300-450 mg every 6 hours for 7-10 days is preferred when coverage for both MRSA and β-hemolytic streptococci is needed, but only if local clindamycin resistance is <10%, according to the Infectious Diseases Society of America 1, 5, 3

The Infectious Diseases Society of America recommends vancomycin 15-20 mg/kg IV every 8-12 hours as the first-line treatment for hospitalized patients with severe or complicated MRSA infections 5, 6, 4
Linezolid 600 mg IV twice daily is equally effective and may be superior for complicated skin infections, as suggested by the American College of Emergency Physicians 5, 6

The American Academy of Pediatrics recommends clindamycin 10-13 mg/kg/dose every 6-8 hours for children with MRSA infections, while avoiding doxycycline in children <8 years old due to tooth discoloration and bone growth effects 5, 3, 6
The Infectious Diseases Society of America suggests avoiding doxycycline (pregnancy category D) during pregnancy and using clindamycin or TMP-SMX (after first trimester) as safer alternatives 6, 3

The Infectious Diseases Society of America recommends a treatment duration of 5 days if clinical improvement occurs for uncomplicated infections, extending only if symptoms have not improved 1, 6
Reassessing clinically within 48-72 hours is crucial to ensure appropriate response, as suggested by the American College of Emergency Physicians 4