How should a cat bite be managed, including wound care, tetanus prophylaxis, antibiotic therapy, and rabies risk assessment?

Management of Cat Bites

Cat bites require immediate wound irrigation, antibiotic prophylaxis with amoxicillin-clavulanate, tetanus assessment, and rabies risk evaluation—with antibiotics being particularly critical given the high infection risk from deep puncture wounds. 1

Immediate Wound Care

Thoroughly irrigate the wound immediately with water or dilute povidone-iodine solution using a 20-mL or larger syringe. 2 This is the single most important intervention, as wound cleansing alone markedly reduces infection risk and rabies transmission in animal studies. 2

• Remove any foreign bodies and devitalized tissue during wound exploration 2
• Examine for deep structure involvement: assess neurovascular function (pulses, sensation), range of motion of adjacent joints, and potential penetration of periosteum or joint capsule 2, 1
• Avoid suturing cat bite wounds when possible, as closure increases infection risk 2
• Primary closure may only be considered for facial wounds with low infection risk, but this is generally not recommended for cat bites given their puncture nature 1

Antibiotic Prophylaxis

Prescribe amoxicillin-clavulanate 875/125 mg twice daily for 3-5 days as first-line prophylaxis. 1 This is non-negotiable for cat bites.

Cat bites have the highest infection risk among animal bites, particularly on the hand, due to:

• Deep puncture wounds that inoculate bacteria into tissue 3, 4
• Pasteurella multocida present in over 50% of cat bite wounds, which can cause serious infection with severe complications 4

All cat bites warrant antibiotic prophylaxis because they meet multiple high-risk criteria: 1

• Puncture-type wounds
• High risk of hand involvement
• Potential for deep tissue penetration including periosteum or joint capsule
• Wounds that may have resultant edema

Alternative regimens if amoxicillin-clavulanate is contraindicated: 1

• Doxycycline 100 mg twice daily (excellent activity against P. multocida)
• Moxifloxacin 400 mg daily (provides anaerobic coverage as monotherapy)
• Avoid clindamycin monotherapy—it misses P. multocida 1

Tetanus Prophylaxis

Assess tetanus immunization status and administer booster if indicated. 2

• Give tetanus toxoid if last dose was >5 years ago for contaminated wounds or >10 years for clean wounds 2

Rabies Risk Assessment

Consult local health officials immediately to determine if rabies postexposure prophylaxis (PEP) is indicated. 1

Critical decision points for rabies PEP: 2

• If the cat is available: A healthy domestic cat with current rabies vaccination history is unlikely to transmit rabies 2
• If the cat can be observed: Observe for 10 days; if the animal remains healthy, rabies PEP is not needed
• If the cat is unavailable, stray, or acting abnormally: Initiate rabies PEP immediately—this is a medical urgency 2

Rabies PEP regimen for previously unvaccinated persons: 2

• Human rabies immune globulin (HRIG) 20 IU/kg infiltrated around and into the wound, with remainder given intramuscularly (day 0 only, up to day 7 maximum)
• Rabies vaccine on days 0,3,7, and 14 2
• Previously vaccinated individuals receive vaccine only (no HRIG) 2

Bites that do not break the skin do not require rabies PEP. 3

Common Pitfalls

• Delaying antibiotic prophylaxis: Cat bites have exceptionally high infection rates; do not wait for signs of infection 1, 4
• Underestimating puncture depth: Cat teeth create narrow, deep wounds that may penetrate joints, tendons, or bone—always explore thoroughly 3
• Closing cat bite wounds: This traps bacteria and dramatically increases infection risk 2
• Missing hand involvement: Hand wounds from cat bites have the greatest infection risk and worst outcomes if untreated 4
• Inadequate wound irrigation: Use high-pressure irrigation with adequate volume—this is as important as antibiotics 2

Imaging and Follow-up

• Imaging (X-ray) is indicated if there is suspicion of retained foreign body, bone involvement, or joint penetration 3
• Arrange follow-up within 24-48 hours to assess for infection development 3
• Instruct patients to return immediately for signs of infection: increasing pain, swelling, erythema, purulent drainage, fever, or lymphangitis 1