Animal Bite Treatment Guidelines

Immediate Wound Management

• All animal bite wounds should be thoroughly irrigated with copious amounts of running tap water or sterile saline until no visible debris remains, and any wound contaminated with animal saliva must be evaluated at a medical facility as soon as possible 1
• Running tap water is as effective as sterile saline and superior to antiseptic agents like povidone-iodine for irrigation 1
• Avoid aggressive debridement that causes additional tissue damage 2

Wound Closure Decisions

• Do not close infected wounds or wounds presenting >8 hours after injury 3
• Facial wounds are an exception and may be closed primarily after meticulous irrigation and prophylactic antibiotics 3
• For clean, early-presenting wounds (<8 hours), consider approximation with Steri-Strips rather than sutures 3
• Most bite wounds should be left open to heal by secondary intention 2

Antibiotic Prophylaxis and Treatment

• Amoxicillin-clavulanate is the first-line antibiotic for both prophylaxis and treatment of dog and cat bites 4, 3
• Prophylactic antibiotics are indicated for hand wounds, puncture wounds, cat bites, wounds presenting >8 hours after injury, immunocompromised patients, and wounds with crush injury or devitalized tissue 4, 3
• First-line oral antibiotic options include amoxicillin-clavulanate 4, 3
• Penicillin-allergic patients can use doxycycline, penicillin VK plus dicloxacillin, or fluoroquinolones plus metronidazole or clindamycin 4, 3
• Avoid using first-generation cephalosporins, penicillinase-resistant penicillins alone, macrolides, and clindamycin monotherapy due to poor activity against P. multocida 4, 3

Tetanus Prophylaxis

• Administer tetanus toxoid (0.5 mL intramuscularly) if vaccination status is outdated or unknown 3, 2
• Give booster if >10 years since last dose for clean wounds or >5 years since last dose for contaminated wounds 2

Rabies Risk Assessment and Prophylaxis

• Rabies risk depends on the species of animal, geographic location, circumstances of attack, and vaccination status of domestic animal 4, 2, 3
• For previously unvaccinated persons with suspected rabies exposure, administer rabies immune globulin (HRIG) on day 0 and rabies vaccine (HDCV or PCECV) on days 0, 3, 7, 14, and 28 3, 2
• Never use the gluteal area for vaccine administration due to lower antibody titers 2
• Begin vaccination immediately without waiting for animal observation results 2

Special Considerations

• Cat bites have a higher infection rate than dog bites (50% vs 15-20%) and harbor P. multocida 75% of the time 4
• Clenched-fist injuries (human bites) require immediate expert hand surgery evaluation due to high risk of joint capsule penetration, septic arthritis, and osteomyelitis 3
• Hand wounds are at the highest risk location for infection and complications and always warrant antibiotic prophylaxis 4, 3

Wound Care and Follow-Up

• Cover clean wounds with occlusive dressing to promote healing 1
• Elevate injured extremity, especially if swollen 4, 3
• Follow up within 24 hours by phone or office visit 3
• Signs requiring immediate re-evaluation include redness, swelling, foul-smelling drainage, increased pain, or fever 1

Critical Pitfalls to Avoid

• Do not use antiseptic solutions for irrigation (no benefit over water/saline) 1
• Do not close wounds >8 hours old or contaminated wounds 3
• Do not delay medical evaluation for animal saliva-contaminated wounds 1
• Do not use antibiotics with poor Pasteurella coverage (cephalexin, macrolides, clindamycin alone) 4
• Do not administer rabies vaccine in gluteal area 2
• Do not wait for animal observation results before starting rabies prophylaxis 2

Guidelines for Management of Traumatic Finger Amputation from Human Bite

Immediate Hemorrhage Control

• Life‑threatening bleeding must be stopped within minutes to prevent exsanguination. 5
• If direct pressure fails or the radial pulse is absent, apply a tourniquet immediately; this is the fastest life‑saving technique. 6
• Tourniquet time should be kept as short as possible—ideally < 2 hours, although durations up to 6 hours have been tolerated. 5

Wound Irrigation and Dressing

• Perform copious irrigation with running tap water or sterile saline until no visible debris remains. 7
• Do not use iodine‑based or antibiotic‑containing solutions for irrigation; they offer no advantage over water or saline. 8
• Do not close the wound; infected wounds or those presented > 8 hours after injury should never be sutured. 9
• After irrigation, cover the wound with a sterile occlusive dressing. 10

Antibiotic Prophylaxis (Critical)

• Human bite wounds carry a 10–20 % infection risk; prophylactic antibiotics are indicated regardless of wound appearance. 9
• First‑line therapy is amoxicillin‑clavulanate for both prophylaxis and treatment. 9
• The typical microbial mix includes aerobic streptococci (~80 %), staphylococci, Haemophilus spp., Eikenella corrodens, Fusobacterium spp., Peptostreptococcus spp., Prevotella spp., and Porphyromonas spp. 9
• Many anaerobes produce β‑lactamases, rendering them resistant to penicillin and first‑generation cephalosporins. 9
• For patients with penicillin allergy, prescribe doxycycline or a fluoroquinolone combined with metronidazole or clindamycin. 9
• Avoid agents with inadequate coverage such as first‑generation cephalosporins, penicillinase‑resistant penicillins alone, macrolides, and clindamycin monotherapy. 9

Tetanus Prophylaxis

• Update tetanus status immediately; administer 0.5 mL tetanus toxoid intramuscularly if vaccination history is unknown or outdated. 9

Urgent Surgical Consultation

• All hand wounds from human bites require prompt evaluation by a hand‑surgery specialist. 9
• Clenched‑fist injuries and finger amputations have a very high risk of joint‑capsule penetration, septic arthritis, and osteomyelitis. 9
• Early surgical assessment (minimizing time from injury to evaluation) improves survival and functional outcomes. 5

Additional Wound Care

• Elevate the injured hand to reduce swelling and promote healing. 9
• Immobilize with a sling for out‑patients or a tubular stockinet attached to an IV pole for in‑patients. 9
• Arrange follow‑up within 24 hours via telephone or office visit to monitor for complications. 9

Infectious Disease Considerations

• Human bites may transmit hepatitis B, hepatitis C, and HIV; assess exposure risk and provide appropriate testing and prophylaxis. 9

Medical Management of Dog Bite Wounds

Immediate Irrigation and Debridement

• Large‑volume irrigation with running tap water or sterile saline until all visible debris is removed is as effective as sterile saline and superior to antiseptic solutions such as povidone‑iodine. 11
• Aggressive debridement that enlarges the wound or causes additional tissue injury should be avoided. 12
• Iodine‑based or antibiotic‑containing irrigation solutions provide no advantage over plain water or saline and should not be used. 12

Prophylactic Antibiotic Therapy

• First‑line: Amoxicillin‑clavulanate is recommended for both prophylaxis and treatment because it covers the typical polymicrobial flora of dog bites, including Pasteurella multocida (present in ~50 % of bites). 12
• Indications for prophylactic antibiotics include:
  
  • Hand wounds (the site with the highest infection risk). 13
  • Wounds presenting > 8 hours after injury. 13
  • Immunocompromised or asplenic patients. 13
  • Patients with advanced liver disease. 13
  • Wounds adjacent to bone or joint (risk of periosteal penetration). 13
  • Moderate‑to‑severe injuries, especially to the hand or face. 13
• Penicillin‑allergic alternatives:
  
  • Doxycycline monotherapy is acceptable. 12
  • Penicillin VK + dicloxacillin. 12
  • Fluoroquinolone (ciprofloxacin, levofloxacin, or moxifloxacin) + metronidazole or clindamycin for anaerobic coverage. 12
• Agents to avoid because of poor activity against P. multocida: first‑generation cephalosporins (e.g., cephalexin), penicillinase‑resistant penicillins alone (dicloxacillin), macrolides (erythromycin), and clindamycin monotherapy. 12

Wound Closure Strategies

• The majority of dog‑bite wounds should not be closed primarily; they are best left to heal by secondary intention or delayed primary closure. 12
• Infected wounds or wounds older than 8 hours should never be closed primarily. 12
• Facial wounds are an exception: they may be closed primarily by a plastic surgeon after meticulous irrigation, careful debridement, and administration of prophylactic antibiotics. 12
• For clean wounds presenting < 8 hours after injury, approximation with Steri‑Strips (instead of sutures) is recommended, followed by delayed or secondary closure as needed. 12

Tetanus Prophylaxis

• Administer 0.5 mL tetanus toxoid intramuscularly when the patient’s vaccination status is outdated or unknown. 12
• If the patient has never received Tdap, the Tdap formulation is preferred over Td. 13

Rabies Risk Assessment

• Immediate consultation with local health authorities is required to determine the need for rabies prophylaxis based on animal species, geographic prevalence, attack circumstances, and the dog’s vaccination status. 12
• High‑risk scenarios that warrant prophylaxis include bites from feral or wild animals and exposures in regions with high rabies prevalence. 12

Wound Care and Elevation

• After irrigation and debridement, cover the wound with a clean occlusive dressing to promote healing and reduce infection risk. 11
• Elevate the injured extremity (e.g., sling for outpatients or tubular stockinet for inpatients) to accelerate healing. 12

Follow‑up and Monitoring

• Arrange a follow‑up contact (phone or office visit) within 24 hours to assess for signs of infection. 12
• Increasing pain disproportionate to the injury, especially near bone or joint, should prompt immediate re‑evaluation for possible periosteal penetration. 12
• If infection progresses despite appropriate antimicrobial and supportive therapy, hospitalize for intravenous antibiotics and possible surgical intervention. 12

Intravenous Antibiotic Options for Severe Infection

• Ampicillin‑sulbactam – broad coverage including Pasteurella spp. 12
• Piperacillin‑tazobactam – extended‑spectrum β‑lactam/β‑lactamase inhibitor. 12
• Second‑generation cephalosporin (cefoxitin) – effective against many gram‑negative and anaerobic organisms. 12
• Carbapenems (ertapenem, imipenem, meropenem) – reserved for highly resistant or polymicrobial infections. 12
• A single initial dose of parenteral antimicrobial may be given before transitioning to oral therapy. 12

Special Considerations for Hand Wounds

• Hand wounds carry the highest risk for infection and complications (e.g., septic arthritis, osteomyelitis, tendonitis) and therefore always require prophylactic antibiotics. 12

Duration of Therapy for Specific Complications

• Osteomyelitis – 4–6 weeks of targeted antibiotic therapy. 12
• Septic arthritis or synovitis – 3–4 weeks of targeted antibiotic therapy. 12
• Tendonitis, subcutaneous abscess, bacteremia – duration individualized based on clinical response. 12

Critical Pitfalls to Avoid

• Do not close wounds older than 8 hours or any infected wounds (except facial wounds managed as described). 12
• Do not use antiseptic solutions for irrigation; they offer no benefit over water or saline. 12
• Do not prescribe antibiotics with poor Pasteurella coverage (e.g., cephalexin, macrolides, clindamycin alone, dicloxacillin alone). 12
• Do not perform aggressive debridement that causes additional tissue damage or impairs closure. 12

Rabies Prophylaxis and Immediate Wound Management for Pediatric Goat Bites

Post‑Exposure Rabies Prophylaxis (CDC MMWR 2008)

• Initiate rabies prophylaxis immediately when exposure cannot be ruled out and the child has never received rabies vaccine; do not wait for animal observation results. The regimen includes both rabies immune globulin (HRIG) and rabies vaccine. 14
• HRIG dosing: 20 IU per kilogram of body weight, infiltrated around and into the wound whenever anatomically feasible; any remaining volume is given intramuscularly at a site distant from the vaccine injection. 14
• Rabies vaccine schedule: 1.0 mL intramuscularly in the anterolateral thigh (preferred site for infants and small children) on days 0, 3, 7, 14, and 28, using either HDCV or PCECV. 14
• Separate administration sites: HRIG and rabies vaccine must never be mixed in the same syringe or injected into the same anatomical location. 14

Immediate Wound Irrigation (CDC MMWR 2008)

• Do not delay wound irrigation after a bite; prompt, copious irrigation with running tap water or sterile saline is the single most effective measure to prevent bacterial infection and to markedly reduce the risk of rabies virus transmission. 14

Timing of Rabies Prophylaxis Initiation (CDC MMWR 2008)

• Begin rabies prophylaxis without waiting for the animal’s observation period when rabies exposure is possible; discontinue the regimen only if the animal later tests negative for rabies. 14