Management of Infected Cat Bite Wounds

Introduction

• Infected cat bite wounds require prompt medical attention to prevent complications, with a higher infection rate than dog bites despite causing less tissue trauma, and hand wounds requiring particular attention due to higher risk of complications 1

Antibiotic Treatment

• Amoxicillin-clavulanate is the first-line antibiotic treatment for infected cat bite wounds, providing coverage against both aerobic and anaerobic pathogens, including Pasteurella multocida, which is present in 75% of cat bite infections, and is recommended at a dose of 875/125 mg orally twice daily for adults weighing ≥40 kg, for a duration of 5-7 days for uncomplicated infections, as recommended by the Infectious Diseases Society of America 1
• Alternative treatment options include clindamycin 300-450 mg orally every 6-8 hours PLUS one of the following: trimethoprim-sulfamethoxazole, or fluoroquinolone (ciprofloxacin, levofloxacin) 1
• Carbapenems (ertapenem, imipenem, meropenem) are also effective against infected cat bite wounds 1
• The following antibiotics may be used for prophylaxis or treatment of animal bites:

Wound Care

• The American College of Emergency Physicians recommends copious irrigation with sterile normal saline, debridement of devitalized tissue, leaving infected wounds open, and elevating the affected limb to reduce swelling 1
• Perform irrigation and debridement to decrease the incidence of invasive wound infection, and elevate the affected limb if possible, as stated in the World Journal of Emergency Surgery 3
• Manage pain with oral analgesics and clean the area with mild soap and water to reduce pain and swelling, as recommended by the American Heart Association 4

Special Considerations

• Cat bites have a higher infection rate than dog bites despite causing less tissue trauma, and hand wounds require particular attention due to higher risk of complications 1
• The Centers for Disease Control and Prevention recommend considering longer treatment (3-4 weeks) for tendonitis or synovitis, and extending to 4-6 weeks for osteomyelitis 1
• Cat scratch disease (caused by Bartonella henselae) should be considered if lymphadenopathy develops, and treated with azithromycin, as recommended by the Infectious Diseases Society of America 2
• Tetanus prophylaxis should be administered if not up to date (within 5 years for contaminated wounds) 2
• Consider preemptive oral antibiotics (3-5 days) for high-risk patients, including those who are immunocompromised, asplenic, have advanced liver disease, or have moderate to severe injuries, as recommended by the Infectious Diseases Society of America 2, 5

Prevention

• Advise patients to wear protective clothing (long pants, long sleeves, closed shoes) to prevent insect stings, as recommended by general medical guidelines and the Centers for Disease Control and Prevention 6, 7, 1, 8
• Use insect repellents containing DEET (safe for children >2 months when used as directed) and apply permethrin spray on clothing to prevent insect bites, as recommended by the Centers for Disease Control and Prevention 9