Deer brain worm, Meningeal worm (Parelaphostrongylus tenuis)

The adult brain worm lives in the connective tissue that surrounds the brain of white-tailed deer. In the deer the parasite completes it full life cycle, laying eggs in the brain tissue. Larvae require a snail as an intermediate host. Other herbivores such as the goat can be infected with this parasite if they eat snails carrying the intermediate stage. In the goat, the larvae migrate randomly through the nervous system causing severe neurological disease but the worm cannot reproduce.

Additional animations describing life cycles of parasites that infect the goat.

Cryptosporidium
Eimeria spp. (coccidian)

Dictyocaulus vivparus (lungworm)
Muellerius capillaris (goat lung worm)

Fasciola hepatica (liver fluke)

Haemonchus contortus (barber pole worm)
Ostertagia circumcincta (brown stomach worm)
Trichostrongylus spp. (hair worm)
Nematodirus spp (thin-necked intestinal worm)
Oesophagostomum columbianum (nodular worm)
Strongyloides papillosus (common thread worm)

Parelaphostrongylus tenuis (brain or meningeal worm)
Trichuris ovis (whipworm)
Moniezia expansa (tapeworm)

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