Raccoon poop. Raccoons like to crap in the same place time after time (they call them raccoon latrines) and their stool is filled with this parasite.
B. procyonis roundworms are most prevalent in the midwestern, northeastern, and Pacific western state and in the mountainous regions of Virginia, Kentucky, and West Virginia.
Has also been found in pet Kinkajous (CDC).
About 7% of wildlife rehabilitators (who knew wildlife had drug and alcohol problems; probably why they are called wildlife) are seropositive suggesting subclinical infection(Pubmed).
Meningitis/encephalitis, often eosinophilic. Rare but fatal.
Albendazole and dexamethazone for months.
The eggs are very resistant to death: "Loss of viability resulted when eggs were heated to 62 C or desiccated for 7 months but not when frozen at 15 C for 6 months (PubMed)."