Raccoon roundworm

Source: IT

Subject: Science and Technology

Context: A new European study has found widespread spread of raccoon roundworm (Baylisascaris procyonis) in wild raccoon populations across nine European countries, with very high infection rates.

About Raccoon roundworm:

What it is?

• Raccoon roundworm is a zoonotic parasitic infection caused by the nematode Baylisascaris procyonis, which primarily infects raccoons but can accidentally infect humans and other animals, causing severe neurological and ocular damage.

Origin:

• Native to North America, where raccoons are natural hosts.

• Spread to Europe through import of raccoons for pets and fur farms in the early 20th century.

• Escaped raccoons established wild populations, carrying the parasite with them

Found in:

• Primary host: Raccoons (Procyon lotor).

• Other animals: Dogs, birds, rodents, and small mammals (as accidental hosts).

• Geographic spread: North America (endemic). Europe (now established in at least nine countries, Germany as epicentre).

• North America (endemic).

• Europe (now established in at least nine countries, Germany as epicentre).

• India: Not established due to absence of wild raccoon populations.

Symptoms in humans:

Human infection is rare but often severe due to larval migration:

• Early symptoms: Nausea, fatigue, liver enlargement.

• Neurological signs: Loss of coordination, reduced attention, muscle weakness.

• Severe outcomes: Ocular larva migrans: Blindness. Neural larva migrans: Brain damage, coma, death.

• Ocular larva migrans: Blindness.

• Neural larva migrans: Brain damage, coma, death.

• High-risk group: Children (soil contact, poor hand hygiene)

Key features:

• Extremely hardy eggs: Eggs become infectious after 2–4 weeks in soil. Can survive for years in the environment.

• Eggs become infectious after 2–4 weeks in soil.

• Can survive for years in the environment.

• High reproductive output: Adult worms release millions of eggs in raccoon faeces.

• Difficult diagnosis: No widely available definitive tests in humans.

• High severity, low frequency: Rare infections, but disproportionately serious outcomes.