Anatomical location of main internal parasites in horses.
Nuchal ligament
Neck threadworms (Onchocerca cervicalis)
Stomach
Bots
(Gasterophilus spp),
Large Mouth Stomach Worms
(Habronema muscae), Hairworms
(Trichostrongylus axeï)
Blood vessels
Bloodworm larvae (Strongylus vulgaris),
Intestinal Threadworms (Strongyloides westeri)
Rectum
Pinworms (Oxyuris equi),
Bots (Gasterophilus haemorrhoidalis)
Caecum Colon
Pinworms (Oxyuris equi),
Large Strongyles/Bloodworms (Strongylus spp.),
Tapeworms (Anoplocephala perfoliata),
Small Strongyles (Cyathostomum spp.)
Liver
Ascarids/Large Roundworms (Parascaris equorum),
Large Strongyles/Bloodworms (Strongylus equinus, Strongylus edentalus)
Suspensory ligament
Neck threadworms (Onchocerca cervicalis)
Small intestines
Ascarids/Roundworms (Parascaris equorum),
Intestinal Threadworms (Strongyloides westeri), Tapeworms (Anoplocephala magna)
Lungs
Ascarids/Large Roundworms (Parascaris equorum),
Lungworm (Dictyocaulus arnfieldi)
Skin
Skin lesions
(Habronema spp., Draschia spp., Onchcerca spp.),
Intestinal Threadworms
Eyes
Skin lesions (Habronema spp.)
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Pinworms (Oxyuris equi)

Large Strongyles/ Bloodworms (Strongylus spp.)