If the victim was bitten by an unprovoked undomesticated animal such as a raccoon or a bat, an immediate shot may be necessary to prevent the possibility of a rabies infection.
Contrary to common belief, a human bite can sometimes be more dangerous than that of an animal because human saliva contains many more types of bacteria which may cause infection.
A bite from a domestic pet can be painful but rarely requires a visit to the emergency room and unless obvious bodily harm was sustained, a simple precautionary treatment will suffice.