Metastrongylus

Metastrongylus
Metastrongylus sp. under the microscope
Scientific classification
Kingdom:	Animalia
Phylum:	Nematoda
Class:	Chromadorea
Order:	Rhabditidae
Suborder:	Strongylida
Superfamily:	Metastrongyloidea
Family:	Metastrongylidae
Genus:	Metastrongylus
Species
M. elongatus (Dujardin, 1845) syn. 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 verminous bronchitis. It causes a disease called metastrongylosis.

Species

• Metastrongylus elongatus (Dujardin, 1845) syn. M. apri
• Metastrongylus pudentodectus (Wostokow, 1905)
• Metastrongylus salmi (Gedoelst, 1823)
• Metastrongylus confusus (Jansen, 1964)
• Metastrongylus asymmetricus (Noda, 1973)

Life cycle

File:Metastrongylus lifecycle.gif

Life cycle of Metastrongylus sp.

The 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 feces. The eggs are then eaten by earthworms in which they develop through three larval stages over ten days to become infective. The cycle is completed by the pig eating the earthworm. Infection therefore only occurs where pigs have access to earthworms, for example in outdoor production.^[1] 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.

References

1. ^ "Lungworm Infection: Introduction". The Merck Veterinary Manual. 2006. http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/120700.htm. Retrieved 2007-07-01. 

Cestoda
(Tapeworm infection)

Cyclophyllidea	Echinococcus granulosus/Echinococcus multilocularis (Echinococcosis) · Taenia saginata (beef)/Taenia asiatica/Taenia solium (pork) (Taeniasis/Cysticercosis) · Hymenolepis nana/Hymenolepis diminuta (Hymenolepiasis)
Pseudophyllidea	Diphyllobothrium latum (Diphyllobothriasis) · Spirometra erinaceieuropaei (Sparganosis) · Diphyllobothrium mansonoides (Sparganosis)

Roundworm/
nematode
(Nematode
infection)

Secernentea	Spirurida Camallanina Dracunculus medinensis (Dracunculiasis) Spirurina Filarioidea (Filariasis) Onchocerca volvulus (Onchocerciasis) · Loa loa (Loa loa filariasis) · Mansonella (Mansonelliasis) · Dirofilaria repens (Dirofilariasis) Wuchereria bancrofti · Brugia malayi · Brugia timori Thelazioidea Gnathostoma spinigerum/Gnathostoma hispidum (Gnathostomiasis) · Thelazia (Thelaziasis) Spiruroidea Gongylonema Strongylida (hookworm) Ancylostoma duodenale/Ancylostoma braziliense (Ancylostomiasis, Cutaneous larva migrans) · Necator americanus (Necatoriasis) · Angiostrongylus cantonensis (Angiostrongyliasis) · Metastrongylus (Metastrongylosis) Ascaridida Ascaris lumbricoides (Ascariasis) · Anisakis (Anisakiasis) · Toxocara canis/Toxocara cati (Visceral larva migrans/Toxocariasis) · Baylisascaris · Dioctophyme renale (Dioctophymosis) Rhabditida Strongyloides stercoralis (Strongyloidiasis) Oxyurida Enterobius vermicularis (Enterobiasis · Pinworm)
Adenophorea	Trichinella spiralis (Trichinosis) · Trichuris trichiura (Trichuriasis · Whipworm) · Capillaria philippinensis (Intestinal capillariasis) · Capillaria hepatica

M: IFT helm,arth (acar) helm, arth (lice), zoon helm, arth