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Nematodes in Pigs - Coggle Diagram
Nematodes in Pigs
Ascaris suum (Swine ascarid)
Large 25cm-40cm, 55mm wide
small intestine
largest
Larval migration in the liver cause foci of inflammation that heal as small, fibrous scars –> “milk spots” liver
Fecal flotation
Female parasites are prolific egg layers (2 million eggs per day!
Sunlight and prolonged drying will destroy them
zoonotic
Trichinella spiralis (Trichina worm, pork worm)
4 mm
small intestine
zoonotic, human can be DH
Ingesting meat containing cysts of Trichinella
ELISA
Trichinellosis/Trinchinosis
Human infection may be asymptomatic or mild.
1st week: GI signs
1-2 weeks after infection: systemic symptoms and sigs begin
Facial edema, fever, myalgia, headache, eye pain
Symptoms from muscle invasion: chewing, speech, swallowing, dispnea with heavy infection
Inflammation – cardiac, neurologic or pulmonary
Stephanurus dentatus (kidney worm)
Adult: 2-4.5cm long, resides in the kidney, ureters, peri-renal tissues
Diagnosis: Urine sediment – look for trichostrongyle-type ova
PH earth worm
skin penetration
Oesophagostomum dentatum (nodular worm)
larval stage forms large nodules within the wall of the large intestine
Fecal flotation – strongyle-type egg; nodules and adults in large intestine at necropsy
May go through hypobiosis
Metastrongylus apri (lungworm)
25-60mm in length, resides in the bronchi and bronchioles
IMH earthworm
Trichuris suis (whipworm)
6-8 cm long, resides in large intestine and cecum
Clinical signs: Often occur in young pigs, including poor growth, hematochezia, rectal prolapse. Resistance is both acquired and age-related
