M. apri M. pudentodectus (Wostokow, 1905) M. salmi (Gedoelst, 1823) M. confusus (Jansen, 1964) M. asymmetricus (Noda, 1973) Metastrongylus is a genus of nematodes of the family Metastrongylidae, usually found as lungworms in pigs and sometimes causing parasitic bronchitis.

The eggs are then eaten by earthworms in which they develop through three larval stages over 10 days to become infective.

Infection, therefore, only occurs where pigs have access to earthworms, for example, in outdoor production.

[1] The larvae from the earthworm penetrate the intestine and migrate via the lymph nodes and blood vessels to the lungs, undergoing two more larval stages in the process.

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