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Understanding animal bites
Audience: patients-public, students-learners ยท Review state: published
Why they matter
Animal bites are common, especially from dogs and cats, and most are minor. Their risks are twofold: infection from bacteria in the animal's mouth, and, in some regions, rabies - a viral disease that is almost always fatal once symptoms appear but entirely preventable with prompt treatment after a bite.
Bites from wild animals such as bats, raccoons, foxes, and monkeys carry particular concern and always need medical advice.
First aid
For minor bites, wash the wound thoroughly with soap and running water for several minutes - this is the single most important immediate step - then apply an antiseptic and a clean dressing. Control any bleeding with direct pressure.
Do not close a bite wound with tape or glue, because sealing bacteria inside raises infection risk.
When to seek medical care
See a doctor promptly for any bite that breaks the skin from a cat, wild, or unknown animal; for deep wounds, bites to the face, hands, or joints; and for any bite if your tetanus vaccination is not up to date. Cat bites in particular have a high infection rate because their teeth drive bacteria deep.
Watch for spreading redness, swelling, warmth, pus, fever, or red streaks in the days after a bite - infection needs antibiotics. Rabies risk, especially after unprovoked bites or in regions where rabies circulates, is assessed by the doctor, who may give post-exposure vaccination and immunoglobulin; given in time, it is completely effective.
Prevention
Most bites are preventable: do not approach unfamiliar animals, never disturb an animal that is eating or with its young, and teach children to ask before petting. Avoiding contact with stray and wild animals, and vaccinating pets, removes most of the risk.
Bats are a special case: any direct contact with a bat, or waking up with a bat in the room, warrants medical advice even without a visible bite.
Limitations
General educational overview, not medical advice. Rabies exposure assessment is urgent and belongs with medical services.