Metastrongylus spp. infection in a farmed wild boar (Sus scrofa) in Finland
© Syrjälä et al; licensee BioMed Central Ltd. 2010
Published: 13 October 2010
Metastrongylus spp. (Nematoda, Metastrongylidae) are lung worms of swine and occur worldwide. Species in the family include M. apri, M. pudendotectus, M. asymmetricus, and M. salmi. Earth worms are intermediate hosts and pigs get infected when eating earth worms.
In Finland wild boar farming began in the 1980s and now there are over hundred farms and over 2000 wild boars in different parts of the country. This case report is part of a study aiming to get more information about the diseases that occur in the farmed wild boar population in Finland.
Lungworms were detected in an eight month old farmed wild boar sent for necropsy from a farm situated in eastern Finland. In the group of 25 animals of about the same age, the farmer had noticed poor growth and gait abnormalities. He submitted two euthanized boars (A and B) for necropsy. A routine necropsy was performed and tissue samples were collected for histopathology, bacteriology and parasitology.
In Finland Metastrongylus spp. has occurred sporadically in pigs decades ago in southeastern parts of the country [unpublished, Nikander, . It was not detected in domestic pigs in a large study done in all Nordic countries in 1980’s . It was also not found in a study of Danish organic swine herds . In natural wild boar in many countries this parasite is common [3–6]. In the modern pig industry this infection seems to have been disappeared, because there is no contact with the intermediate host, the earth worms. However, in the farmed wild boar, and in situations where pigs are kept outdoors, Metastrongylus spp. should be considered as a possible cause of poor growth and respiratory signs.
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