A primary exposure to rabies is when the skin mucosa is intact from touching or feeding the animal or from being licked, at which point rabies vaccination is not required and only the skin mucosa needs to be cleaned with soap and water. Secondary exposure refers to minor bites or scratches or abrasions on the skin, but no visible bleeding is seen, and only rabies vaccination is required at this time. If the secondary exposure is on the head or face, if the patient is immunocompromised, or if the animal is not healthy, this is considered a tertiary exposure and requires additional rabies serum. Tertiary exposure is defined as a single or multiple penetrating bite or abrasion of the skin, or a break in the mucous membrane of the skin when licked, or an open wound where the mucous membrane has been licked, both rabies vaccine and rabies serum are required at this time.