Metastrongylosis

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Metastrongylosis is a parasitic disease that affects wild boars and pigs which live outdoors.{{cite journal |last1=García-González |first1=Ángela María |last2=Pérez-Martín |first2=Juan Enrique |last3=Gamito-Santos |first3=José Antonio |last4=Calero-Bernal |first4=Rafael |last5=Alonso |first5=María Alcaide |last6=Carrión |first6=Eva María Frontera |title=Epidemiologic study of lung parasites (Metastrongylus spp.) in wild boar (Sus scrofa) in southwestern Spain |journal=Journal of Wildlife Diseases |date=January 2013 |volume=49 |issue=1 |pages=157–162 |doi=10.7589/2011-07-217 |doi-access=|pmid=23307382|s2cid=38998791 }} It is caused by various species of roundworms of the genus Metastrongylus.{{cite web |title=Lungworm infection (Metastrongylosis) |url=https://vetmed.iastate.edu/vdpam/FSVD/swine/index-diseases/metastrongylosis |website=Iowa State University |accessdate=2018-11-25}} A handful of cases of metastrongylosis have been reported in humans.{{cite journal |last1=Caballero |first1=Henry |last2=Calvopina |first2=Manuel |last3=Korenaga |first3=Masataka |last4=Morita |first4=Tatsushi |title=Human pulmonary infection by the zoonotic Metastrongylus salmi nematode The first reported case in the Americas |journal=The American Journal of Tropical Medicine and Hygiene |date=5 October 2016 |volume=95 |issue=4 |pages=871–873 |doi=10.4269/ajtmh.16-0247|doi-access=free |pmid=27382078 |pmc=5062791}}

Metastrongylus species have a life cycle which involves earthworms as an intermediate host.{{cite book |last1=Jackson |first1=Peter G. G. |last2=Cockcroft |first2=Peter D. |title=Handbook of Pig Medicine |date=2007 |publisher=Saunders/Elsevier |isbn=9780702028281 |page=82 |chapter=Metastrongylosis}} Pigs root for earthworms in soil, and ingest the Metastrongylus larvae which are infesting the earthworms. The larvae migrate to the lungs, and cause the pig to cough and have difficulty breathing.