Treatment of MRSA in Urine Culture

Initial Assessment

The American College of Physicians recommends evaluating for symptoms of urinary tract infection and systemic symptoms to distinguish between asymptomatic bacteriuria, uncomplicated UTI, or complicated UTI with potential bacteremia 1
Blood cultures should be obtained if systemic symptoms are present to rule out concurrent bacteremia, which would require more aggressive management 1
Cultures from purulent drainage before starting antibiotics are crucial to confirm MRSA and guide therapy 1

The Infectious Diseases Society of America recommends trimethoprim-sulfamethoxazole (TMP-SMX) as a first-line oral option: 1-2 double-strength tablets orally twice daily 1
Clindamycin is an alternative first-line oral option: 300-450 mg orally three times daily for adults; 10-13 mg/kg/dose orally every 6-8 hours (not exceeding 40 mg/kg/day) for children 2, 3
Tetracyclines (doxycycline or minocycline) are effective options for adults but should not be used in children under 8 years of age 3

For uncomplicated MRSA bacteriuria without systemic symptoms, treatment should last 7-14 days 1
For complicated MRSA bacteriuria or concurrent bacteremia, treatment should last 2-4 weeks depending on clinical response and clearance of bacteremia 1
For skin and soft tissue infections with MRSA, treatment should last 5-10 days, individualized based on clinical response 3

Follow-up urine cultures should be obtained 48-72 hours after initiating therapy to document clearance of infection 1
Patients with systemic toxicity and/or rapidly progressive infection despite oral antibiotics should be managed as inpatients 2

Good personal hygiene with regular handwashing is recommended to prevent recurrence 3
Keeping draining wounds covered with clean, dry bandages can help prevent recurrence 3
Consider decolonization for patients with recurrent MRSA infections despite optimizing wound care and hygiene measures 3