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20 Cards in this Set
- Front
- Back
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List ascarids of the pig and of man
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Ascaris suum (Pig)
Ascaris lumbricoides (man) |
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Characteristics of Ascarids' eggs
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thick-shelled
resistant to contamination sticky L1-L3 in egg egg with L3 is infective |
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Intermediate host of Ascaris suum
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earthwarm
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Effects of Ascaris suum larva on hosts
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larval migration cause development of sensitization in lung and liver.
Residual "milk spot" in pig liver A.suum larvae in cattle → anaphylaxis |
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Effects of A. suum adults on host
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loss of growth
anti-pepsin & anti-trypsin secretion interference of gut funciton and obstruction of bile duct & pancreatic duct due to their large size |
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Pathogenesis of A. suum
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Larvae → mechanical damage → eoshinophilic inflammation → fibrosis → regeneration → milk spot!
Adult → mechanical damage, haemorrhage and eosinophilic inflammation |
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Life cycle of A. suum
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Egg in faeces → L1-L3 w/in eggs → egg with L3 ingested → hatch in SI → free L3 penetrate mucosa of LI (SI) → portal vein → liver → the lung → break through alveoli → bronchioles → trachea → pharyns → swallowed → SI → mature to reproductive adults in SI and lay large number of eggs
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Ascarids of horses & donkey?
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Parascaris equorum
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Clinical signs of Parascaris equorum
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-diarrhoea
-colic -respiratory signs -liver damage |
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Ascarids that affect fox and dog
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Toxocara canis
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Ascarids that affect only cat
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Toxocara cati
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Ascarids that affect mainly dog and sometimes cat
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Toxascaris leonina
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Compare ascrids of canids and felids in terms of transmission
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Toxocara canis (O, HP, TP → prenatal inf)
Toxocara cati (O, HP, TM → no prenatal inf) Toxascaris leonina (O, Mucosal) |
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Morphological difference between T.canis and T.cati
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T.canis: long alae
T.cati: short more obvious alae |
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How to distinguish eggs of Toxocara sp and Toxascaris sp?
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Toxocara: sticky
Toxascaris: smooth surface |
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Which Ascarids of mammals are zoonotic?
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Toxocara canis
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What is paratenic host of Toxocara sp and Toxascaris sp?
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arthropods, rodents, lizards, and birds
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Pot-bellied appearance dogs are likely to infect with what Nematodes?
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Toxocara canis
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Important aspects of life cycle in terms of control of Toxocara canis
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-Many young animals affected clinically due to peri-natal infection
-must begin treatment at an early age -very resistant eggs -difficult to control paratenic hosts |
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Ascarid of ruminant
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Toxocara vitulorum
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