What is the recommended management protocol for a stray cat bite, including wound care, tetanus prophylaxis, rabies post‑exposure prophylaxis, and appropriate antibiotics?

Stray Cat Bite Protocol

For a stray cat bite, immediately initiate wound care with thorough irrigation, administer tetanus prophylaxis if indicated, start rabies post-exposure prophylaxis without delay (since the cat cannot be observed), and prescribe amoxicillin-clavulanate 875/125 mg twice daily for 3–5 days.

Immediate Wound Management

• Wash the wound thoroughly with soap and water for 15 minutes—this is the single most effective measure to prevent both rabies transmission and bacterial infection 1
• After cleansing, apply a virucidal agent such as povidone-iodine to further reduce viral and bacterial load 1
• Irrigate copiously with sterile normal saline using a ≥20 mL syringe; avoid high-pressure streams that can force bacteria deeper into tissue 2
• Explore the wound carefully for tendon or bone involvement and possible foreign bodies 3

Antibiotic Prophylaxis

Cat bites carry the highest infection risk of all animal bites and require prophylactic antibiotics in virtually all cases. 4

• Prescribe amoxicillin-clavulanate 875/125 mg orally twice daily for 3–5 days as first-line therapy 2, 1
• Cat bite wounds harbor Pasteurella multocida in over 50% of cases, which can cause rapidly developing cellulitis within 12–24 hours and potentially lead to osteomyelitis 4, 5
• Hand wounds from cat bites have the greatest risk of infection and can result in septic arthritis, osteomyelitis, and functional impairment 4, 2
• For penicillin-allergic patients, use doxycycline 100 mg twice daily or a fluoroquinolone combined with clindamycin 1

Wound Closure Decisions

• Facial wounds: Primary closure is acceptable after thorough irrigation, cautious debridement, and initiation of prophylactic antibiotics to achieve optimal cosmetic outcome 2
• Non-facial wounds: Do NOT close primarily; instead approximate margins with adhesive strips and plan delayed primary or secondary closure 2
• Hand wounds: Generally leave unsutured due to heightened risk of deep infection 2
• Any infected wound: Never close primarily 2

Tetanus Prophylaxis

• Administer tetanus toxoid 0.5 mL intramuscularly if the last tetanus vaccination was >5 years ago for contaminated wounds or >10 years ago for clean wounds 2, 1
• Use Tdap rather than Td if the patient has not previously received Tdap 2
• For unvaccinated adults, give the first dose of Td immediately and schedule the second dose 4–8 weeks later and third dose 6–12 months after the second 1

Rabies Post-Exposure Prophylaxis

Because the stray cat cannot be confined and observed for 10 days, initiate rabies PEP immediately. 1

For Previously Unvaccinated Individuals:

• Administer human rabies immune globulin (HRIG) 20 IU/kg on day 0: infiltrate up to half the dose around and into the wound if anatomically feasible, with the remainder injected intramuscularly in the gluteal region 1
• Give rabies vaccine (HDCV, RVA, or PCEC) intramuscularly in the deltoid on days 0,3,7, and 14 (four-dose regimen) 1, 3
• Never exceed 20 IU/kg of HRIG, as higher doses can suppress active antibody production 1
• HRIG may be administered up to day 7 after the first vaccine dose if not given initially; beyond day 7 it is unnecessary 1
• Never inject rabies vaccine in the gluteal area—use deltoid in adults to ensure adequate neutralizing antibody titers 1

For Previously Vaccinated Individuals:

• Administer only 2 doses of rabies vaccine on days 0 and 3—do NOT give HRIG 1

Critical Timing:

• Begin treatment immediately after exposure (within 24 hours ideally), though even delayed treatment is indicated as rabies incubation periods exceeding 1 year have been documented 1

Follow-Up Evaluation

• Schedule follow-up within 48–72 hours to assess for signs of infection and evaluate wound healing 2
• Monitor for cat-scratch disease manifestations for 3–30 days, including papule/pustule at the scratch site, regional lymphadenopathy (typically ~3 weeks), and fever 1
• If regional lymphadenopathy develops, treat with azithromycin 500 mg on day 1 followed by 250 mg daily for 4 additional days in patients >45 kg 1

Critical Pitfalls to Avoid

• Do NOT withhold rabies PEP while attempting to locate or observe a stray cat—initiate immediately 1
• Do NOT use high-pressure irrigation, as it may disseminate bacteria into deeper tissues 2
• Do NOT close infected wounds or high-risk non-facial wounds primarily 2
• Do NOT administer HRIG in the same syringe or at the same anatomical site as the vaccine 2
• Do NOT underestimate cat bite wounds—they appear trivial but carry the highest infection risk, especially Pasteurella multocida, which can cause severe complications including septic shock, meningitis, and endocarditis 4, 6