Raccoon roundworm (Baylisascaris procyonis) can survive years, threatening humans and animals

Baylisascaris procyonis, commonly called raccoon roundworm, produces eggs that can remain viable in the environment for several years, even under harsh conditions. The eggs’ tough outer shell protects them from stressors, allowing the parasite to persist in soil, water and surfaces and increasing the risk of accidental ingestion by humans and other animals.

When humans ingest infective eggs, larvae migrate through the body, causing visceral larva migrans or, more seriously, neural larva migrans that can lead to severe neurological damage, eye involvement and other organ injury. Prompt diagnosis and aggressive anthelmintic therapy—typically albendazole—combined with supportive care are essential for improving outcomes. Prevention focuses on avoiding contact with raccoon feces, thorough cleaning and disinfection of contaminated areas, and public‑health education about the parasite’s durability.