Angiostrongyliasis — photos

Symptoms and syndromes in photos

Main » Infectious diseases » Snail-mediated Helminthiases » Angiostrongyliasis

Adult Angiostrongylus.

Photo 1. Adult Angiostrongylus cantonensis. The adult worm, about one to two cm long, is a common parasite of rodents in the Far East and Pacific. It lives in the pulmonary arterioles. (x3)

First stage larvae in rat faeces.

Photo 2. First stage larvae in rat faeces. The eggs passed in the bloodstream break through the pulmonary tract, are swallowed by the rodent and are passed in the faeces in which they may hatch to first stage larvae, (x 100)

Intermediate snail hosts.

Photo 3. Intermediate snail hosts. Achatina fulica (3), Cipangopaludina chinensis (4), Bradybaena similaris (5). The larvae are eaten by snails of various genera including Achatina, as well as by some slugs and land planarians in which larvae develop to the third stage.

Intermediate snail hosts (Cipangopaludina chinensis).

Photo 4. Intermediate snail hosts (Cipangopaludina chinensis).

Intermediate snail hosts (Bradybaena similaris).

Photo 5. Intermediate snail hosts (Bradybaena similaris).

Third stage larvae in Achatinafulica.

Photo 6. Third stage larvae in Achatinafulica. New rats become infested when they eat the snails containing third stage larvae. (x 100)

Section of larvae in meninges of human brain.

Photo 7. Section of larvae in meninges of human brain. Man may be infested by eating freshwater prawns but how these come to contain larvae is uncertain. He may also be infected by eating snails which contain the larvae. The larvae migrate to the brain where they cause an eosinophilic meningoencephalitis.  

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