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42 Cards in this Set
- Front
- Back
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Oesophagostomum spp description |
Oesophagostomum dentatum and O. quadrispinulatum nodular worms location LI adult - have anterior cuticle egg- thin shelled, not embryonated southern US |
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oesophagostomum life cycle |
eggs passed in feces egg embronates, L1 hatches L1-L2-L3 L3 eaten by pig enters wall LI forms nodules larvae go to lumen and form adults |
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transport hosts oesophagostomum spp |
flies and rats |
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prepatent pd oesophagostumum |
18-24 d |
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when do larvae survive oesophagostomum |
overwinter in southern pastures (not north) dont like hot and dry dont survive if not on pasture or bedding increased egg counts in sows periparturient |
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pathology oesophagostomum |
nodules from L3-L4 interfere intestinal motility and food absorption |
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dx oesophagostomum |
fecal float eggs necropsy |
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tx oesophagostomum |
levimasole, fenbendazole, ivermetin, doramectin, dichlorvos repeat tx to kill L3 and L4 daily pyrantel tartrate to prevent nodules remove feces |
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hyostrongylus robidus description |
red stomach worm location - stomach adult - striated, red body egg - thin shelled, transparent, not embryonated |
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life cycle hyostrongylus robidus |
eggs in feces egg hatches L1 L1-L2-L3 L3 to grass L3 eaten L3 to gastric glands larvae go to stomach lumen and become adults |
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pathology hyostrongylus rubidus |
heavy inf - ulcered mucosa light inf - reduced wt gain CS anemia, anorexia, black tarry feces |
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dx hyostrongylus rubidus |
fecal float - hard to tell eggs from oesophagostomum and globocephalus |
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tx hyostrongylus rubidus |
ivermectin, doramectin, fenbendazole |
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globocephalus urosubulatus description |
pig hookworm location SI adult - large mouth cavity, pair of teeth egg - thin shelled, clear, non-embryonated |
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globocephalus urosubulatus life cycle |
direct |
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pathology, dx, tx globocephalus urosubulatus |
usually non, severe - anemia dx fecal float tx not needed |
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truchuris suis description |
whipworm location cecum and colon adult - large posterior end, thin anterior end egg - lemon shaped, symmetric, bipolar plugs, nonembryonated |
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life cycle trichuris suis |
eggs pass feces eggs embryonate egg + L2 infective, eaten go to cecum or colon wall go to lumen, become adult |
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trichuris suis pathology |
usually asymptomatic if heavy inf then anemia, bloody diarrhea, may cause nodules in bowel |
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trichuris suis dx |
fecal float - egg is dense so high SG or centrifuge |
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tx trichuris suis |
ivermectin, fenbendazole, dichlorvos hard to eliminate tx piglets at 7 wk clean feces |
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Metastrongylus spp description |
Metastrongylus elongatus, M. pudendotectus, M. salmi location - lung, bronchi IH earthworm adult - slender, white, male has copulatory bursa egg - thin shelled, larvated |
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Metastrongylus spp life cycle |
embryonated eggs coughed up, swallowed, go in feces egg ingested by earthworm L1-L2-L3 larvae released when earthworm eaten lymphatics - mesenteric LN lymphatics - heart lungs alveoli -- bronchi adult |
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pathology metastrongylus spp |
light infection - not pathogenic heavy infection - chronic cough, poor feed conversion |
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dx metastrongylus spp |
dense eggs are hard to float |
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tx metastrongylus spp |
fenbendazole, ivermectin, doramectin, levimasole house indoors |
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stephanurus dentatus description |
kidney worm location - pelvis of kidney, ureters, perirenal fat adult - stout, mottled egg - ellipsoid, thin shell, not embryonated paratenic host - earthworm |
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lifecycle stephanarus dentatus |
female produces nonembryonated eggs in urine eggs - L3 in soil L3 can go through skin, or be ingested and then enter cirulatory system. can also go into earthworm and then earthworm is eaten goes to liver migrate in liver/pancreas 2-9 mo go to other organs, those in urinary tract become adults |
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pathology stephanurus dentatus |
dermatitis from L3 penetrating skin migrating larvae can cause organ damage, esp liver, paralysis SC nephritis from adults in kidney |
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dx stephanurus dentatus |
eggs in urine sedimentation |
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tx stephanurus dentatus |
can tx twice a year since such a long prepatent pd fenbendazole, ivermectin, doramectin |
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thick stomach worms are |
physocephalus sexalatus and ascarops strongylina |
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description thick stomach worms |
both location stomach, egg - thick shelled, larvated |
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life cycle thick stomach worms |
embryonated eggs ingested by dung beetles L3 released when dung beetle is eaten develops to adult in stomach |
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pathology, dx, tx thick stomach worms |
gastritis, ulcers, anorexia, emaciated dx fecal float, eggs are dense tx ivermectin |
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trichinella spiralis description |
location - adult - SI larvae - striated muscle of many mammals adult - slender worm, when in muscle curled up w nurse cell around it eggs hatch in uterus and thus lays live larvae (larviporous) |
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how do humans get infected with trichinella spiralis |
ingestion of undercooked meat, homemade sausage |
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sylvatic and urban cycles of trichinella spiralis |
sylvatic cycles: transmission btwn wild carnivores and prey animals/carrion urban cycles: transmission btwn man, pigs, rats, etc |
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life cycle trichinella spiralis |
females deposit L! larvae in intestinal wall larvae go to lymphatics thoracic duct heart lung heart systemic circulation L1 larvae encyst striated m larvae exyst when in SI of another host mature to adults in SI |
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pathology trichinella spiralis |
swine - rarely CS other hosts - intestinal inf = vomiting, diarrhea, fever, abd discomfort, fatigue skeletal m invasion - (after 2 wk) - eosinophilia, fever, chills, cough, edema around eye, joint and m pain |
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dx trichinella spiralis |
m biopsy serum ELISA slaughterhouse |
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tx trichinella spiralis |
pigs no tx human thiabendazole cook meat thoroughly or freeze (some) |
