Diagnosing MRSA Skin Infections

Clinical Presentation

Purulent lesions such as abscesses, furuncles (boils), or carbuncles, often with surrounding cellulitis, are typical presentations of MRSA skin infections, according to the Infectious Diseases Society of America 2, 3

The presence of purulent drainage or collection is a key indicator for suspecting MRSA skin infection, as recommended by the Infectious Diseases Society of America 1, 3
Skin infection associated with penetrating trauma, especially from illicit drug use, should raise suspicion for MRSA, according to the Infectious Diseases Society of America 1
Evidence of MRSA infection elsewhere on the body or known nasal colonization with MRSA are also risk factors for MRSA skin infection, as noted by the Infectious Diseases Society of America 1, 3
Systemic signs of infection (fever, tachycardia, hypotension) with skin infection should prompt consideration of MRSA, as recommended by the Infectious Diseases Society of America 3

Bacterial culture is essential for definitive diagnosis of MRSA skin infections, according to the Infectious Diseases Society of America 2, 3
For abscesses and purulent lesions, obtaining culture of the drainage material is crucial, as recommended by the Infectious Diseases Society of America 2
Blood cultures should be obtained in patients with malignancy, severe systemic features, or unusual predisposing factors, according to the Infectious Diseases Society of America 1

History of previous MRSA infection or colonization is a significant risk factor for MRSA skin infection, as noted by the Infectious Diseases Society of America 3
Recent antibiotic use increases the risk of MRSA skin infection, according to the Infectious Diseases Society of America 4, 5

Incision and drainage is the primary treatment for abscesses, and appropriate antibiotic therapy should be initiated based on local susceptibility patterns, as recommended by the Infectious Diseases Society of America 2, 3
Culture results should guide definitive antibiotic therapy, according to the Infectious Diseases Society of America 2
Consider decolonization for recurrent infections with mupirocin nasal ointment and chlorhexidine body washes, as recommended by the Infectious Diseases Society of America 2

Failing to culture purulent skin lesions can lead to misdiagnosis, according to the Infectious Diseases Society of America 2
Treating with beta-lactam antibiotics alone when MRSA is suspected is inappropriate, as noted by the Infectious Diseases Society of America 1
Not performing incision and drainage for abscesses can worsen outcomes, according to the Infectious Diseases Society of America 2
Overlooking the need for decolonization in recurrent cases can lead to continued infection, as recommended by the Infectious Diseases Society of America 2