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Raccoons have adapted to urban life and are commonly seen or encountered by King County residents in parks, neighborhoods or yards. Raccoons may carry diseases that can be spread to people (zoonoses) and pets. These diseases include the raccoon roundworm, leptospirosis, and rabies. Raccoons can also cause serious scratch and bite injuries to people and pets.

Raccoons establish community latrines — sites where they repeatedly deposit fresh feces that are very likely to contain roundworm eggs that can be hazardous to human health. Once deposited in the environment, the eggs develop into the infectious form in 2-4 weeks, and can survive in the soil for several years. If these infectious eggs are inadvertently swallowed by humans, the larvae (immature stage of worms) hatch out of the eggs and may move into the organs of the body causing serious disease. Young children are most at risk. 

Learn more about diseases from raccoons.

Diseases from raccoons to humans

  • Leptospirosis + Leptospirosis in dogs fact sheet
    Leptospirosis in people: Leptospirosis is a disease caused by bacteria called Leptospira that infect both people and a wide range of animals. It occurs worldwide but is more common in temperate and tropical areas of the world. Some people infected with leptospirosis will have no symptoms at all, and some people will become severely ill. Some wild and domestic animals, such as cattle, pigs, dogs, raccoons, and rodents, carry the Leptospira bacteria and pass them in their urine. Soil or water contaminated with infected urine is the most common route of human infection.

    In late 2004 King County began to see an increase in leptospirosis in dogs. Between 2004 and 2008, 110 confirmed or probable canine cases with 37 fatalities were reported to the King County Zoonotic Disease Program. A horse and one cat were also reported. Fortunately, no King County residents are known to have become infected during this outbreak. However, people could potentially get the infection from the same environmental sources as dogs (contaminated soil or water), and people in contact with an infected dog could get the disease through exposure to the dog's urine.

  • Raccoon roundworm (Baylisascaris infection)
    Baylisascaris, an intestinal raccoon roundworm, can infect a variety of other animals including humans. Symptoms of infection in people depend on how many eggs are ingested and where in the body the larvae migrate (travel to). Once inside the body, eggs hatch into larvae and cause disease when they travel through the liver, brain, spinal cord, or other organs. Ingesting a few eggs may cause few or no symptoms, while ingesting large numbers of eggs may lead to serious symptoms. Symptoms of infection may take a week or so to develop. If a person is suspected of having swallowed soil contaminated by raccoon droppings, consult a health care provider immediately as preventative medication may be indicated. Be sure to report the concern about recent exposure to raccoon feces to your doctor.
  • Raccoons and rabies prevention
    Raccoons carry rabies in many parts of the U.S. In a typical year, over 2,500 raccoons nationwide are reported with laboratory-confirmed rabies. Fortunately, Washington state has not had a documsented rabies case in a raccoon. However, rabies in raccoons remains a concern as infected animals could be illegally or accidentally brought in from other states or a raccoon could get rabies from an infected bat. Raccoon bites to people must be reported to Public Health for evaluation of rabies risk. Protect pet dogs, cats and ferrets by vaccinating them against rabies. Do not attract raccoons by feeding them or allowing them access to pet food, garbage cans or other food sources. It is illegal to keep raccoons as pets in this and most other states.

Wildlife resources

  • Contact an experienced wildlife control service for help cleaning up latrines and removing problem raccoons. Refer to the directory of Nuisance Wildlife Control Officers trained and regulated by the Washington Department of Fish and Wildlife.

  • If You Care, Don't Feed Us, Public Health
    This downloadable brochure describes the health risks of feeding wildlife such as raccoons. Neighborhood solutions to wildlife problems are emphasized.

  • Living with Wildlife series, WA Dept of Fish and Wildlife
    Washington Department of Fish and Wildlife hosts a series of informational handouts about wildlife. You can find information about raccoons, pigeons, rats, crows, squirrels and many other wild animals. You can also access information about how locate a wildlife rehabilitator and how to hire a wildlife control company.