Baylisascaris is an Infection by the raccoon roundworm Baylisascaris procyonis which is found commonly in raccoons. When infective eggs of this roundworm are ingested by humans, Baylisascaris larvae hatch in the intestine and travel through the organs and muscles. This is the larva migrans syndrome. Some cases have resulted in death. Signs and symptoms of infection may take a week or so after ingestion of eggs to develop.