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==Introduction==

==Introduction==

[[Image:Parascaris equorum donkey.jpg|right|thumb|250px|<small><center>Adult ''P. equorum'' in a four-year-old donkey that died of colic. Most worms were found blocking the ileocaecal junction and in the caecum, with a few in the small intestine. (Image courtesy of [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]

[[Image:Parascaris equorum donkey.jpg|right|thumb|250px|<small><center>Adult ''P. equorum'' in a four-year-old donkey that died of colic. Most worms were found blocking the ileocaecal junction and in the caecum, with a few in the small intestine. (Image courtesy of [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]

'''''Parascaris equorum''''' is among the largest nematodes that affect equids. Generally it is believed that it is the same species of ascarid that is found in horses and donkeys. They are large roundworms up to 40 cm in length. Ascarids are considered to mainly affect foals, as adult horses acquire an effective resistance.  

'''''[[Parascaris equorum]]''''' is among the largest nematodes that affect equids. Generally it is believed that it is the same species of ascarid that is found in horses and donkeys. They are large roundworms up to 40 cm in length. Ascarids are considered to mainly affect foals, as adult horses acquire an effective resistance.  

However, the situation in donkeys appears to be different. A study in South Africa revealed high infection prevalence with

However, the situation in donkeys appears to be different. A study in South Africa revealed high infection prevalence with