Human Bites - Complications

Authored by Dr Mary Harding, 04 Jul 2017

Patient is a certified member of
The Information Standard

Reviewed by:
Prof Cathy Jackson, 04 Jul 2017

Infection is the most common complication and it occurs in 9-50 out of every 100 human bites. The usual type of infection is with a type of germ called bacteria. This can be infection of the surrounding skin (cellulitis). It may also spread to tissues close to the skin - in particular, bones (osteomyelitis) or tendons (infectious tenosynovitis). Occasionally infection can spread further, causing infection around the brain (meningitis), of the heart (endocarditis) or throughout the body (sepsis or streptococcal toxic shock syndrome).

Other infections which may be transmitted through human bites include:

Hepatitis C and HIV are very unlikely to be spread from a bite. In order to get one of these infections from a bite, there usually has to be blood in the saliva of an infected person biting. Hepatitis B is more likely to spread via saliva but it is still much rarer than through needlestick injuries.

Other complications include disfigurement or deformity of the affected part. This may occur if there is a large scar, or if bones and tendons have become involved. Certain parts of the body do not heal very well if cut, such as the ear or nose, and may become deformed as they heal from a bite.

Some people are more at risk of infection following a bite. For example:

Some specific wounds are more at risk of infection. For example:

  • Bites to the hands or feet.
  • Bites which have had stitches to close the wound.
  • Deep bites.
  • Bites on the head or face of a baby or infant.
  • Bites over joints.

Infection with germs (bacteria) can be prevented by using an antibiotic. Usually the one used is an antibiotic called co-amoxiclav. Many doctors treat all human bites with antibiotics to be on the safe side. Others only treat those which are at high risk of infection. Early antibiotics help to reduce the chance of any deformity or loss of function.

People who are at higher risk of infections such as hepatitis B or HIV include men who have sex with men, intravenous drug users, and sex workers. If you have been bitten by someone in one of these categories, you might be considered to be at high risk. If you are considered to be at high risk of developing hepatitis B, you may be given a vaccination to try to prevent this. If you are at high risk of catching HIV from the bite, you may be given some medication to try to prevent this.

The most common complication following a bite is infection of the wound. See a doctor if the skin surrounding a wound becomes more tender, painful, swollen, or reddened over the few days following the bite.

Rarely, some germs (bacteria) can get into the bloodstream through a wound and cause a serious infection in the body. See a doctor if you become generally unwell with a high temperature (fever), shivers, or other worrying symptoms within a week or so after a bite.

Further reading and references

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