Possums do not have a true immunity to rabies, but they are remarkably resistant to it. Their low normal body temperature makes it very difficult for the rabies virus to survive and multiply inside them. While a possum can technically carry the virus, it is extremely rare for one to become infectious and transmit it to a human or pet.
Why Are Possums So Resistant To Rabies?
The main reason comes down to body temperature. The rabies virus is fragile and thrives best at warm temperatures. Most mammals have a normal body temperature around 98-102°F. Possums run cooler, with a normal temperature closer to 94-97°F.
That few degrees makes a real difference. The rabies virus struggles to replicate at those lower temperatures. Research has shown that the virus does not multiply efficiently in a possum’s body. This means the infection rarely reaches the brain or the salivary glands, which is where the virus becomes transmissible.
This is not the same as immunity. Immunity means the body actively fights off and destroys the virus. In possums, the virus simply has a hard time getting established because the environment inside the body is not suitable for it.
Can A Possum Actually Get Rabies?
Yes, technically a possum can be infected with the rabies virus. The resistance is strong, but it is not absolute. There are documented cases where the virus has been found in possums.
However, these cases are exceptionally rare. When wildlife agencies test animals for rabies, possums account for a very small fraction of positive cases compared to raccoons, skunks, bats, and foxes. The virus does not survive long enough in a possum’s system to reach the levels needed for transmission in most cases.
Think of it this way. A possum might be exposed to the virus through a bite from an infected animal. But the virus replicates so slowly in the possum’s cooler body that the infection usually fizzles out before it can cause disease or spread.
Do Possums Carry Other Diseases?
Being resistant to rabies does not mean possums are disease-free. They can carry other pathogens that are a concern for humans and pets.
Possums can carry leptospirosis, a bacterial infection spread through urine. They can also carry tuberculosis and various parasites like fleas, ticks, and mites. These parasites can transmit diseases like Lyme disease or Rocky Mountain spotted fever to humans and pets, even if the possum itself does not show symptoms.
The most common reason people encounter a sick possum is not rabies. It is often distemper, a viral disease that affects the nervous system and can make a possum appear disoriented, lethargic, or unafraid of humans. Distemper in possums is not the same strain that affects dogs, but the symptoms can look similar to rabies to an untrained eye.
What Should You Do If You See A Possum Acting Strange?
Any wild animal that appears sick, aggressive, or unafraid should be treated with caution. A healthy possum will usually run away or play dead when threatened. This “playing possum” behavior is an involuntary response to extreme fear and can last from a few minutes to several hours.
If a possum is wandering in circles, drooling excessively, or attacking objects without fear, do not approach it. This behavior is abnormal. While rabies is unlikely, it is not impossible. The safest approach is to keep your distance and contact local animal control or a wildlife rehabilitation center.
Never attempt to handle a possum with bare hands. Even a healthy possum will bite if cornered. Their teeth are sharp, and a bite can introduce bacteria that cause serious infection.
Are Possums Dangerous To Pets?
The risk to pets is low but not zero. A possum will generally avoid a fight. They prefer to hiss, show their teeth, or play dead rather than engage. However, a dog or cat that corners a possum may get bitten or scratched in the struggle.
The bigger risk to pets is not rabies but the parasites and bacteria a possum can carry. Fleas and ticks can easily transfer from a possum to a dog or cat. Leptospirosis can be contracted if a pet drinks water contaminated with possum urine.
Keeping pets vaccinated against rabies is still essential. Rabies vaccination for dogs and cats is required by law in most states. This protects your pet in the rare event that they encounter a rabid animal of any species.
Should You Remove Possums From Your Property?
Possums are generally beneficial to have around. They eat insects, rodents, snails, and even ticks. Studies have shown that possums can consume thousands of ticks in a single season, which helps reduce the spread of tick-borne diseases.
They are not aggressive and rarely cause structural damage. They may take shelter under decks, sheds, or porches. If a possum is living in an attic or inside a wall, that is a different situation and should be handled by a professional.
If you want to discourage possums from your yard, remove food sources. Secure trash can lids, do not leave pet food outside overnight, and clean up fallen fruit from trees. Block access to crawl spaces and under-deck areas with sturdy fencing.
Do not attempt to trap and relocate a possum yourself. Relocation is stressful for the animal and often fatal, as they do not survive well in unfamiliar territory. It is also illegal in some areas without a permit.
Are Possums Immune To Rabies The Science Explained In Short
The science is clear. Possums are not immune to rabies, but their low body temperature makes them highly resistant. The virus cannot replicate efficiently in their bodies, so the infection rarely progresses to a transmissible state.
This resistance is a biological quirk, not a true immune response. It means the risk of getting rabies from a possum is extremely low. But it does not mean possums are harmless. They can carry other diseases and parasites, and they will defend themselves if threatened.
The practical takeaway is simple. Enjoy possums from a distance. Appreciate the role they play in controlling pests. Do not handle them, do not feed them, and keep your pets vaccinated. If you see one acting strangely, leave it alone and call a professional.
Frequently Asked Questions
Can a possum give a human rabies?
It is extremely unlikely. The rabies virus does not survive well in a possum’s body, so they rarely become infectious. No human case of rabies from a possum bite has been confirmed in the United States.
Why do possums not get rabies?
Their normal body temperature is several degrees lower than most mammals, around 94-97°F. The rabies virus cannot replicate efficiently at this temperature, so the infection does not usually take hold.
What diseases do possums carry?
Possums can carry leptospirosis, tuberculosis, and parasites like fleas, ticks, and mites. These parasites can transmit diseases to humans and pets even when the possum appears healthy.
Is it safe to touch a possum?
No, you should never handle a possum with bare hands. They will bite if cornered, and their bites can cause serious bacterial infections even without rabies.
