Lesson
Triage the Person Before the Bite
Bite care begins with hemorrhage, shock, airway, anatomy, function, time, animal context, exposure biology, and host reserve rather than a product recommendation.
- Hemorrhage
- Deep anatomy
- Species
- Exposure route
- Host risk
Life threats come first
Surface size can mislead
Protect deep structures
Start clocks early
Stabilize life threats
Activate emergency services for uncontrolled bleeding, shock, airway or neck injury, amputation, major tissue loss, or penetrating chest, abdominal, pelvic, or neurovascular trauma.
Map the wound
Record species, mechanism, time, site, depth, contamination, tissue loss, bleeding, pain, and whether teeth or foreign material may remain.
Test anatomy and function
Check active motion, strength, sensation, perfusion, joint pain, tendon excursion, and distal neurovascular status. Small openings can conceal major damage.
Start prevention clocks
Document tetanus series, rabies-relevant exposure, animal availability, visible blood, hepatitis B immunity, immune status, and time since exposure.
Quick check
Lesson
Read the Injury Pattern Left by Teeth
Dog bites more often crush and tear, while cat bites commonly create deep narrow punctures. Anatomy and host biology determine how much danger hides below the surface.
- Crush
- Puncture
- Devitalized tissue
- Hand anatomy
- Capnocytophaga
Inspect devitalized tissue
Assume hidden inoculation
Test function carefully
Lower the referral threshold
Inspect dog-bite trauma
Look for crush injury, ragged laceration, devitalized tissue, fracture, vascular damage, and hidden injury beyond the skin edges.
Respect cat punctures
Cat teeth can inoculate tendon sheaths, joints, bone, and closed spaces. Small wounds on the hand can progress rapidly despite a mild initial appearance.
Protect function-critical sites
Bites to hands, face, feet, genitals, cartilage, joints, tendons, nerves, or vessels receive a lower threshold for direct evaluation.
Identify high-risk hosts
Asplenia, immune compromise, diabetes, decompensated liver disease, alcohol use disorder, vascular disease, edema, and limited follow-up increase the danger of serious infection.
Quick check
Lesson
Protect the Hand and Assess Both People
Human bites include direct bites and closed-fist injuries. Oral flora, joint penetration, tendon injury, tooth fragments, and blood exposure create risks for both people involved.
- Closed fist
- Eikenella
- Joint penetration
- Blood exposure
- Safeguarding
Inspect the true tract
Small wounds can be deep
Assess both people
Delay threatens function
Expose the true tract
A dorsal knuckle wound after striking teeth is examined with the hand positioned as during injury because opening the fist can move skin away from the deeper tract.
Assume deep anatomy is possible
Assess tendon excursion, joint pain, tooth fragments, fracture, infection, and delayed presentation. Suspected joint or tendon involvement requires urgent surgical evaluation.
Assess both exposure directions
Visible blood can expose the bitten person through the wound and the person biting through oral mucosa. Record whose blood contacted which tissue.
Preserve safety and dignity
Consider assault, intimate-partner violence, child or elder abuse, self-defense, occupational exposure, and barriers to follow-up without replacing clinical care with judgment.
Quick check
Lesson
Reduce Inoculum and Preserve Function
Immediate soap-and-water cleansing and copious irrigation are active treatment. Exploration, imaging, debridement, drainage, and closure decisions follow anatomy and contamination.
- Soap and water
- Irrigation
- Foreign body
- Debridement
- Closure
Reduce inoculum early
Do not probe blindly
Debride by indication
Follow-up remains essential
Clean immediately
Wash with soap and water and irrigate thoroughly. Do not postpone cleansing while waiting for rabies, tetanus, or antibiotic decisions.
Explore safely
Look for retained teeth, devitalized tissue, joint penetration, tendon injury, fracture, and foreign material. Do not probe blindly or remove deeply embedded objects casually.
Debride and drain by indication
Remove devitalized tissue selectively and drain abscesses when required. Procedure, imaging, or specialist care can be more important than changing oral antibiotics.
Choose closure deliberately
Face, hand, puncture, crush, contamination, delay, infection, tissue loss, host risk, and follow-up determine primary closure, delayed closure, or open management.
Quick check
Lesson
Match Therapy to Oral Flora and Host Risk
Bite infections are frequently polymicrobial. Animal oral flora, human oral flora, skin organisms, anaerobes, wound depth, devitalized tissue, and host reserve determine the microbial problem.
- Pasteurella
- Eikenella
- Anaerobes
- Capnocytophaga
- Polymicrobial
Rapid local infection can occur
Common narrow drugs can fail
Asplenia raises urgency
Source control matters
Recognize animal oral flora
Pasteurella can cause rapid local infection after dog or cat bites. Streptococci, staphylococci, Capnocytophaga, and anaerobes can also contribute.
Recognize human oral flora
Human bites can include streptococci, Staphylococcus aureus, Eikenella corrodens, and multiple anaerobic organisms.
Protect high-risk hosts
Capnocytophaga can rarely cause fulminant sepsis after dog or cat saliva exposure, especially with asplenia, immune compromise, or alcohol use disorder.
Think by compartment
Purulence, abscess, tendon sheath, joint, bone, necrosis, and systemic illness change culture, source-control, route, and duration decisions.
Quick check
Lesson
Use Preemptive Antibiotics Where Risk Justifies Them
Antibiotics are not a substitute for wound care and are not required for every superficial exposure. Benefit is more plausible in human bites and high-risk animal wounds, anatomy, hosts, or closure plans.
- High-risk wound
- Human bite
- Amoxicillin clavulanate
- Allergy
- Short course
Benefit is more plausible
Complications can accelerate
Match oral flora
Prophylaxis is not closure
Identify high-risk exposure
Hand, face, foot, genital, cartilage, puncture, crush, edema, delayed presentation, deep injury, primary closure, and significant tissue destruction increase concern.
Identify high-risk host
Immune compromise, asplenia, diabetes, decompensated liver disease, poor circulation, edema, and limited follow-up lower the threshold for preemptive therapy.
Preserve the needed spectrum
Amoxicillin clavulanate is a common oral first choice. Allergy alternatives must still cover relevant Pasteurella, Eikenella, streptococci, staphylococci, and anaerobes.
Close the stewardship loop
Use the recommended prophylaxis duration, explain adverse effects, and reassess rather than extending antibiotics automatically.
Quick check
Lesson
Treat Infection and Secure Source Control
Established infection requires severity classification, useful microbiology, aerobic and anaerobic coverage, organ and allergy review, and prompt management of abscess or deep-space disease.
- Cellulitis
- Abscess
- Culture
- Mixed coverage
- Source control
Trajectory defines concern
Use results to narrow
Account for allergy and organs
Procedure can be decisive
Recognize progression
Increasing pain, warmth, swelling, pus, odor, spreading color change, lymphangitis, fever, systemic illness, or functional decline supports infection.
Culture selectively
Obtain drainage, abscess material, deep tissue, or another high-quality specimen for severe, unusual, recurrent, or treatment-failing infection when results can change care.
Cover mixed flora
Use therapy active against relevant aerobes and anaerobes. Verify allergy, renal and hepatic function, pregnancy, age, weight, interactions, severity, and oral versus intravenous feasibility.
Escalate deep disease
Abscess, tenosynovitis, septic arthritis, osteomyelitis, necrotizing infection, severe cellulitis, and sepsis require urgent imaging, procedure, specialist care, or parenteral therapy.
Quick check
Lesson
Use Public Health to Determine Rabies Risk
Rabies risk depends on a credible exposure route, mammal species, geography, animal behavior and health, severity, travel, and whether the animal can be observed or tested.
- Bat
- Reservoir species
- Geography
- Ten-day observation
- Public health
Objects do not transmit rabies
Risk varies by place
Coordinate ten-day observation
Do not guess alone
Define a credible exposure
Bites, scratches, and infectious saliva contacting broken skin or mucosa can transmit rabies. Clothing, bedding, and intact objects do not.
Use species and geography
Bats are a risk across most of the United States. Raccoon, skunk, fox, mongoose, and dog risk varies by location and travel history.
Use animal availability correctly
A healthy dog, cat, or ferret can undergo a formal ten-day observation under public-health coordination. Illness during observation triggers immediate reporting and testing decisions.
Escalate bat and severe exposure
Direct bat contact that cannot be definitively excluded, reservoir species, multiple wounds, head or neck exposure, young children, and foreign-country dog exposure need prompt assessment.
Quick check
Lesson
Build Immediate and Active Rabies Protection
When PEP is indicated, immediate wound cleansing reduces inoculum, HRIG supplies passive antibody for unvaccinated people, and vaccine generates active immunity on a defined schedule.
- Wound cleansing
- HRIG
- Day zero
- Four-dose series
- Immune compromise
Begin immediately
One dose for unvaccinated people
Use the deltoid or thigh
Regimen changes
Start with wound cleansing
Wash all wounds thoroughly with soap and water. A virucidal agent such as povidone iodine can be used for irrigation when available.
Place HRIG correctly
For an unvaccinated person, give HRIG once and infiltrate as much as anatomically feasible around all wounds. Give any remainder intramuscularly distant from vaccine. Do not exceed the recommended dose.
Give vaccine correctly
Unvaccinated immunocompetent people receive vaccine on days zero, three, seven, and fourteen. Use the deltoid or age-appropriate thigh, never the gluteal area.
Adapt for immune history
Previously vaccinated people receive vaccine on days zero and three without HRIG. Immunocompromised unvaccinated people receive an additional day twenty-eight dose and require response planning.
Quick check
Lesson
Close Tetanus, Blood Exposure, and Follow-up Gaps
Bite care is incomplete until tetanus protection, human-bite blood exposure, infection trajectory, animal status, function, adverse effects, reporting, and safeguarding have explicit owners and dates.
- Tetanus
- HIV nPEP
- Hepatitis B
- Return rule
- Safeguarding
Document the series
Human bites expose both people
Context matters
Set a dated checkpoint
Apply tetanus wound rules
Saliva-contaminated bites are dirty or major wounds. Use documented primary series, time since last dose, HIV, and severe immunodeficiency to determine vaccine and TIG.
Evaluate visible-blood exposure
Human bites without blood exposure do not routinely indicate HIV nPEP. Visibly bloody saliva contacting susceptible tissue can require urgent case-by-case HIV, hepatitis B, and hepatitis C evaluation.
Reassess early
High-risk and infected bites need a clear twenty-four to forty-eight-hour checkpoint. Worsening at any time, systemic illness, disproportionate pain, lymphangitis, or functional decline requires escalation.
Track the whole event
Document antibiotics, adverse effects, wound progress, motion, sensation, animal observation or testing, rabies plan, reporting, safeguarding, and access barriers.
Quick check
Module test
Check the connections.
Each attempt draws 10 questions from the complete 112 question bank.
Each attempt draws a fresh set and rearranges the answer choices.
References
Current clinical foundation.
Lecture material was synthesized with the following contemporary guidance. Verify local policy and current guidance before applying clinical information.