What raccoons carry
and what it means

What Is Raccoon Rabies?

Rabies is a viral disease of the central nervous system caused by lyssavirus. It infects all mammals, including humans, and is almost universally fatal once clinical symptoms appear. Raccoons are the most commonly reported rabid wild animal in the United States, accounting for roughly 30–35% of all reported animal rabies cases annually.

A key fact often missed in public discussion: raccoon-variant rabies (the specific strain circulating in raccoon populations) is genetically distinct from other rabies variants. The raccoon rabies epizootic sweeping the eastern U.S. began in the late 1970s when a population of infected raccoons was transported from Florida to Virginia for hunting, and has spread northward and westward since. In the Midwest and western U.S., raccoon rabies prevalence is significantly lower than in the East.

How Is It Transmitted?

Rabies is not transmitted through: casual contact with a healthy raccoon, contact with raccoon urine or feces, touching a raccoon with intact skin, or being in the same area as an infected animal. The virus is present in saliva and nervous tissue, not in blood, urine, or feces.

Symptoms in Raccoons

Human Risk: The Real Numbers

Despite raccoons being the most common rabid animal in the U.S., actual human deaths from raccoon-transmitted rabies are extraordinarily rare — fewer than 1–2 cases per decade in the entire United States. This is largely because the post-exposure prophylaxis (PEP) protocol is highly effective when administered promptly, and because most people bitten by raccoons seek medical attention.

However, the near-zero death rate depends entirely on people seeking treatment. Once rabies symptoms appear in humans, the disease is essentially 100% fatal. The window for effective PEP is the period between exposure and symptom onset — which can range from days to months depending on the location and severity of the bite. Never wait to "see if symptoms develop."

Prevention

What Is Baylisascaris procyonis?

Baylisascaris procyonis is a large roundworm (up to 22 cm long) that lives harmlessly in the intestines of raccoons — studies suggest 70–80% of raccoons in some populations are infected. The raccoon is the definitive host and suffers no ill effects. The danger arises when other animals — including humans — accidentally ingest the microscopic eggs shed in raccoon feces.

Once ingested by a non-raccoon host, the larvae hatch and migrate through body tissues in search of a suitable environment. In their intended host (a raccoon), larvae would eventually reach the intestine. In a human or other non-raccoon host, the larvae cannot complete this journey and instead migrate through muscle, organs, eyes, and — in the most severe cases — the brain, causing neural larva migrans (NLM), a potentially fatal or permanently disabling condition.

Why It's Underappreciated

Rabies gets vastly more public attention than roundworm, despite roundworm being a more realistic everyday risk for most people. The reason is that rabies cases are immediately apparent and dramatic, while roundworm infection is initially silent and may not produce symptoms for weeks or months after exposure. By the time severe neurological symptoms appear, the larvae have already caused significant damage — and there is no reliable treatment once larvae have reached the central nervous system.

Documented human cases of severe NLM from Baylisascaris are rare but include cases of permanent blindness, severe brain damage, and death — primarily in young children who had contact with raccoon feces in sandboxes, gardens, or playgrounds.

Transmission and Egg Persistence

A single infected raccoon can shed millions of eggs per day in its feces. The eggs are microscopic, sticky, and extremely persistent in the environment — they can remain viable in soil for years, and are highly resistant to most common disinfectants. This is what makes raccoon latrines (communal defecation sites) particularly hazardous: contamination accumulates over time and remains infectious long after the raccoons have moved on.

Identifying and Cleaning a Raccoon Latrine

A raccoon latrine is recognizable by: a pile of dark, tubular feces (often containing seeds, fur, or crayfish shells), located in a consistent spot that accumulates over time. The smell is strong and distinctive. If you find one, do not disturb it without protection — disturbing dry feces can aerosolize eggs.

Safe removal requires: disposable gloves (nitrile), N95 or better respirator, disposable coveralls if the latrine is large, and boiling water or a propane torch to deactivate eggs in soil (chemical disinfectants do not kill Baylisascaris eggs). Feces should be double-bagged and disposed of in the trash, not composted. Wash all tools with boiling water. Wash hands thoroughly afterward.

Prevention

What Is Canine Distemper?

Canine distemper virus (CDV) is a paramyxovirus closely related to human measles. It is one of the most significant infectious diseases in wild carnivore populations worldwide, affecting not just raccoons but also coyotes, foxes, wolves, otters, ferrets, and many other species. In raccoons, distemper epidemics can kill 50–70% of a local population, causing dramatic population crashes followed by gradual recovery.

Crucially, canine distemper is not transmissible to humans. It cannot infect people. This distinguishes it from rabies and roundworm, but it remains important because of its effects on raccoon populations and the very real risk it poses to domestic dogs.

Symptoms in Raccoons

Distemper progresses through several stages and produces a wide range of symptoms. Early signs include nasal and ocular discharge, coughing, lethargy, and loss of appetite. As the disease progresses to the nervous system, raccoons display the neurological signs most commonly reported by the public: stumbling, circling, disorientation, apparent paralysis, and seizures. These neurological symptoms are clinically indistinguishable from rabies, which is why both diseases require the same response: do not approach, call animal control.

A Major Population Regulator

Distemper is arguably the most important disease-based population control mechanism for raccoons in North America. Where raccoon densities become very high — particularly in urban and suburban areas — distemper outbreaks can sweep rapidly through the population. These outbreaks may seem alarming (many sick raccoons visible in public areas), but they are a natural regulatory mechanism. Populations generally recover within 2–4 years after a major epizootic.

Risk to Dogs

Unvaccinated dogs that come into contact with infected raccoons — or their secretions — can contract distemper. The disease in dogs follows a similar progression: respiratory signs first, then neurological involvement. Distemper in dogs is serious, often fatal, and has no cure — treatment is supportive only. The standard DHPP vaccine (commonly called the "distemper shot") provides excellent protection and is a core puppy vaccine for good reason.

What Is Leptospirosis?

Leptospirosis is caused by spiral-shaped bacteria of the genus Leptospira. Raccoons are one of several wildlife species (along with rats, deer, and livestock) that can carry and shed leptospires in their urine without showing illness. The bacteria can survive in warm, moist environments — particularly standing water and wet soil — for weeks to months after being shed.

Human leptospirosis is sometimes called "Weil's disease" in its severe form. Most human infections cause a flu-like illness that resolves on its own. In a minority of cases, particularly in immunocompromised individuals, it can progress to serious kidney or liver damage, pulmonary hemorrhage, or meningitis. In the U.S., leptospirosis is relatively uncommon but is significantly underdiagnosed because mild cases are often attributed to flu or other causes.

How Transmission Occurs

Leptospires enter the body through: cuts or abrasions in skin exposed to contaminated water or soil; mucous membranes (eyes, nose, mouth) in contact with contaminated water; and rarely through ingestion of contaminated water. Direct contact with raccoon urine without a wound is generally not a significant risk — the bacteria need a route into the body.

The highest-risk scenarios include: wading in floodwater in areas with high raccoon (or rat) activity, gardening in soil contaminated with raccoon urine, and dogs swimming in or drinking from ponds or streams frequented by raccoons.

Symptoms and Treatment

In humans, leptospirosis typically presents 2–30 days after exposure with sudden fever, chills, severe headache, muscle pain, vomiting, and sometimes red eyes. Most cases resolve within a week without specific treatment. Severe cases require hospitalization and intravenous antibiotics. In dogs, leptospirosis causes kidney and liver dysfunction and can be fatal if untreated — veterinary treatment with antibiotics is effective when started early.

Giardia

Giardia is a protozoan parasite found in the intestines of many mammals including raccoons. Cysts are shed in feces and can contaminate water supplies and soil. Human infection typically causes intestinal illness — cramping, diarrhea, nausea — that is unpleasant but rarely serious in healthy individuals. Giardia is commonly associated with contaminated water sources (rivers, lakes, streams) in areas with high wildlife activity rather than direct raccoon contact.

Other Common Raccoon Parasites

Beyond roundworm and Giardia, raccoons carry a variety of internal and external parasites with varying degrees of zoonotic potential:

Fleas and ticks: Raccoons host several flea and tick species that can bite humans and pets. Raccoon fleas rarely establish themselves on dogs or cats but can cause temporary irritation. Ticks carried by raccoons (particularly Dermacentor and Ixodes species) can transmit Lyme disease and other tick-borne illnesses, though the tick must transfer from the raccoon to a human or pet to cause infection.

Sarcoptic mange: Caused by the mite Sarcoptes scabiei, mange is common in raccoon populations and produces the characteristic patchy, crusty appearance seen in affected animals. Sarcoptic mange can temporarily infect humans from direct contact with an infected animal, causing a self-limiting skin rash that resolves without treatment. It does not establish permanent infection in humans.

Hookworms: Raccoon hookworms can cause "cutaneous larva migrans" in humans — a creeping skin rash produced by larvae attempting to burrow through skin. Not dangerous but unpleasant and easily treated with antiparasitic medication.

What Is Raccoon Parvovirus?

Raccoon parvovirus (Procyon lotor parvovirus, sometimes called raccoon enteric coronavirus or mink enteritis virus in older literature) is a highly contagious viral disease that primarily affects young raccoons. It causes severe hemorrhagic gastroenteritis — bloody diarrhea, vomiting, lethargy, and rapid dehydration — that can be fatal in kits within days. Adult raccoons that survive infection typically develop robust immunity.

Raccoon parvovirus is related to but distinct from canine parvovirus (CPV-2). Dogs vaccinated against canine parvovirus do not have demonstrated cross-protection against the raccoon strain, and vice versa. The risk to domestic dogs from raccoon parvovirus appears to be low, but the relationship between these viruses continues to be studied.

Role in Kit Mortality

Parvovirus is one of the leading causes of mortality in raccoon kits, particularly in dense urban populations where exposure pressure is high. Wildlife rehabilitators working with orphaned kits take parvovirus seriously as a biosecurity concern — infected kits can appear healthy for several days before sudden deterioration. Kits that arrive in care from high-density urban areas, or that show any gastrointestinal symptoms, should be assumed potentially infectious and isolated from other kits.

Core Vaccinations That Protect Against Raccoon Diseases

If Your Pet Has Had Contact With a Raccoon

The appropriate response depends on the nature of the contact and your pet's vaccination status:

Preventing Raccoon Contact

The Attic Problem

Raccoons denning in attics and crawlspaces are a common urban and suburban problem — and a genuine health concern. Over time, a denning raccoon (typically a mother with kits) creates a latrine area in the attic where feces accumulate. This creates a long-term Baylisascaris egg reservoir in an enclosed space that people may later enter without protection.

Beyond parasites, raccoon urine and feces accelerate the deterioration of attic insulation, may promote mold growth, and create significant odors. The structural damage from raccoon activity (torn insulation, gnawed wiring, broken vents) is often as costly as the remediation itself.

Safe Eviction Protocol

The safest approach is to hire a professional wildlife removal company for attic raccoon situations — particularly if kits are present, as removing a mother without her kits creates an abandoned-kit situation. If you choose to handle it yourself, the key steps are: wait until kits are old enough to move with the mother (typically 8–12 weeks), use harassment methods (bright lights, ammonia-soaked rags, loud radio) to make the attic uncomfortable, wait for the family to vacate, then seal all entry points with hardware cloth before they can return.

Attic Remediation After Raccoon Eviction

After raccoons have vacated, the attic should be assessed for contamination. If significant fecal accumulation is present, remediation requires: full respirator (N95 minimum, P100 preferred), disposable coveralls and gloves, removal and disposal of contaminated insulation in sealed bags, application of an enzyme-based biological cleaner to surfaces (chemical disinfectants don't kill Baylisascaris eggs, but enzyme cleaners and heat can denature them), and replacement of insulation. Professional attic remediation companies exist specifically for this purpose and are worth the investment for significant contamination.

Immediate Steps (Within Minutes)

What to Expect at the Doctor

Your physician will assess the wound, clean it further, and consult with local public health authorities to determine whether post-exposure prophylaxis (PEP) is indicated. PEP for rabies consists of a series of injections: one dose of rabies immune globulin (RIG) administered at the wound site on day 0, plus four doses of rabies vaccine over 14 days (days 0, 3, 7, and 14). PEP is highly effective when started before symptoms appear.

If you have been previously vaccinated against rabies (for example, as a wildlife worker), the protocol is shorter and simpler — two vaccine doses, no RIG. Make sure to inform your doctor of prior vaccinations.

Beyond Rabies: What Else to Discuss with Your Doctor

A raccoon bite or scratch may also warrant: wound cleaning and closure assessment (deep wounds may require sutures), tetanus booster if not current, and discussion of Baylisascaris risk if there was fecal exposure involved in the incident. Your physician and local public health department will guide you through the appropriate protocol for your specific circumstances.