Rabies spreads through the saliva of an infected animal, almost always through a bite that breaks the skin. The virus cannot pass through intact skin. It enters your body through puncture wounds, open cuts, scratches, or contact with your eyes, mouth, or other mucous membranes. Once inside, it travels along your nerves toward your spinal cord and brain, where it multiplies before spreading back out to the salivary glands, completing the cycle that allows it to infect the next host.
The Most Common Way People Get Rabies
A bite from an infected animal is by far the primary route. The animal’s saliva carries the virus directly into the wound, giving it access to nearby nerve endings. From there, the virus moves slowly along nerve fibers toward the central nervous system. This journey can take weeks or months depending on how far the bite is from the brain. A bite on the hand, for example, gives the virus a longer path to travel than a bite on the face or neck.
Globally, dogs are the overwhelming source. They cause 99% of human rabies deaths outside the United States, and the disease kills roughly 70,000 people worldwide each year. In the U.S., where pet vaccination programs have largely eliminated dog rabies, wild animals account for more than 90% of confirmed cases. Bats are the leading source (35% of reported animal cases), followed by raccoons (29%), skunks (17%), and foxes (8%).
Non-Bite Routes That Still Count
Bites get the most attention, but scratches from an infected animal can also transmit the virus if they break the skin and the animal’s claws carry saliva. Similarly, if an infected animal licks an open wound or your eyes or mouth, the virus can enter through those surfaces. These routes are less common than bites, but they’re medically significant enough to warrant treatment.
In extremely rare cases, rabies has spread through organ transplants. Since 1978, four transplant-related rabies events have occurred in the United States, affecting a total of 13 recipients. In the most recent case, reported in early 2025, a kidney recipient died 51 days after transplant from a donor whose rabies went undiagnosed. Among all 13 recipients across the four events, every person who received post-exposure treatment survived, and every person who didn’t died.
Airborne transmission is theoretically possible in enclosed spaces with extremely high concentrations of virus particles, such as bat caves, but documented human cases from this route are essentially nonexistent in everyday life. You cannot catch rabies from petting an animal’s fur, touching dried saliva, or having casual contact with wildlife that doesn’t involve a bite, scratch, or mucous membrane exposure.
Why Bat Exposure Is Treated Differently
Bat bites are a special concern because they can be so small you don’t notice them. A bat’s teeth leave marks that may look like minor skin irritation or be invisible entirely. This is why public health guidelines recommend a thorough risk assessment, and potentially treatment, if you wake up in a room with a bat, or if a bat was near someone who couldn’t reliably tell whether contact occurred, such as a young child, someone sleeping, or a person with impaired awareness. The bat doesn’t need to be seen biting you for the exposure to be considered real.
If the bat can be captured and tested negative for rabies, treatment isn’t needed. But if the bat escapes or can’t be tested, the assumption is that exposure may have occurred.
What the Virus Does Inside Your Body
After entering through a wound, the rabies virus behaves unlike most infections. It doesn’t spread through your bloodstream. Instead, it hijacks the nerve cells nearest to the bite and travels inward along those nerves toward the spinal cord. Once it reaches the central nervous system, it multiplies rapidly in the brain. From there, it fans back out along nerves to the salivary glands, which is why infected animals shed the virus in their saliva.
The incubation period, the gap between the bite and the first symptoms, typically ranges from a few weeks to several months. Bites closer to the brain (face, neck) tend to produce symptoms faster. Bites on the extremities give more time, which is critical because treatment during this window is highly effective. Once symptoms appear, however, rabies is nearly 100% fatal. Fewer than 20 people in recorded medical history have survived symptomatic rabies.
What Happens After a Potential Exposure
If you’re bitten or scratched by a wild animal, or by any animal you can’t confirm is vaccinated, the first step is thorough wound washing with soap and water. This alone significantly reduces the amount of virus at the wound site. From there, post-exposure treatment involves two components: an injection of rabies immune globulin (antibodies that neutralize the virus immediately) and a series of four vaccine doses given over two weeks, on days 0, 3, 7, and 14. People with weakened immune systems receive a fifth dose on day 28.
The immune globulin is injected directly around the wound whenever possible, giving the antibodies immediate access to the virus at the entry point. The vaccine doses then train your immune system to produce its own antibodies going forward. When started before symptoms develop, this treatment is extremely effective. The key factor is time: washing the wound and beginning treatment as soon as possible after exposure gives the best outcome.
Which Animals Pose the Highest Risk
Not every animal bite carries the same level of concern. In the eastern United States, about 10% of raccoons that bite or scratch people or pets turn out to have rabies. For skunks and foxes, that figure jumps above 20%. In Puerto Rico, mongooses are the primary reservoir, and more than 80% of mongooses involved in human or pet exposures test positive for rabies.
Small rodents like squirrels, hamsters, rats, and mice are almost never found to carry rabies and have not been known to transmit it to humans. Rabbits are similarly low-risk. If you’re bitten by one of these animals, rabies treatment is rarely recommended. Livestock like cattle and horses can contract rabies from wildlife, so bites from farm animals in areas with active wildlife rabies still warrant medical evaluation.
Any mammal can technically carry rabies, but reptiles, birds, fish, and insects cannot. If an animal is behaving unusually, staggering, approaching people without fear, or being aggressive without provocation, those are classic warning signs of rabies infection and a reason to avoid contact entirely.