Metastrongylus
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 Metastrongylus sp. under the microscope
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M. elongatus (Dujardin, 1845) syn. M. apri |
Metastrongylus is a genus of nematodes of the family Metastrongylidae, usually found as lungworms in pigs and sometimes causing verminous bronchitis. It is causing disease called metastrongylosis.
[edit] Species
- Metastrongylus elongatus (Dujardin, 1845) syn. M. apri
- Metastrongylus pudentodectus (Wostokow, 1905)
- Metastrongylus salmi (Gedoelst, 1823)
- Metastrongylus confusus (Jansen, 1964)
- Metastrongylus asymmetricus (Noda, 1973)
[edit] Life cycle
Life cycle is indirect. The eggs are laid by the adult worm in the bronchi, they are coughed up, swallowed and passed out via the manure. They are eaten by earth worms in which they develop through three larval stages over ten days to become infective! The cycle is completed by the pig eating the earth worm. Infection therefore only occurs where pigs have access to earth worms, for example in outdoor production. The larvae from the earth worm penetrate the intestine and migrate via the lymph nodes and blood vessels to the lungs undergoing two more larval stages in the process. The prepatent period is 3-4 weeks.
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