Common raccoon roundworm

About Raccoon Roundworm

Raccoon roundworm, also known as Baylisascaris procyonis, is a harmful parasite that is primarily found in an infected raccoon's intestines. Raccoon roundworm spreads in the environment where raccoons defecate (poop), also known as raccoon latrines. Their latrines can be found in various locations, including trees, raised surfaces, decks, attics, and garages. Raccoon roundworm infections are very rare in California but can potentially cause severe damage to the brain, spinal cord, and other vital organs, if infected. Young children, toddlers, and individuals with developmental disabilities are at higher risk since they often put their hands in their mouth. There have been less than 10 human cases in California since 1993.

How it Spreads

Generally, raccoon roundworm spreads by a person touching or inhaling raccoon dropping particles or touching the soil/surfaces where raccoon droppings have been. The roundworm eggs stick to the hands and can be swallowed if a person touches their mouth with their contaminated hands. 

Signs and Symptoms

Symptoms vary depending on the number of infecting larvae in the body and location in the body. Generally, symptoms can range from sensitivity to light, blindness, eye inflammation, cough, and chest pain.

How Can I Protect Myself?

To protect yourself and your pets, it's essential to eliminate factors that attract raccoons, including securing vents, picking up ripe fruits around the yard, and keeping garbage bins closed and secure. By removing the key needs of raccoons—food, water, and shelter—you can reduce the risk of exposure to raccoon roundworm. Learn more about raccoons and how to prevent them by visiting our raccoon informational page.

If you have identified a raccoon latrine on your property, ensure to clean it up safely.