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Case Study Nematodes
Term | Definition |
---|---|
Ascarids | Toxocara canis/cati; Toxascaris leonina; Ascaris suum |
Toxocara cani/T. cati Adult | Cream-colored; cervical alae; 3 large lips; Spaghetti-like; Small intestine |
Toxocara canis/T. cati Larva | Liver, lungs, other tissues |
Toxocara canis/T. cati Egg | Spherical; thick, fine-pitted outer shell; single embryo on inside |
Domestic Host for T. canis | Dog |
Domestic Host | DH |
DH for T. cati | Cat |
Independent Host | IH |
IH of Toxocara canis/T. cati | Paratenic; possible rodent |
Prepatent Period | PP |
PP of Toxocara canis/T. cati | 6 weeks |
Life Cycle of Toxocara canis/T. cati | Adults in small intestine lay eggs, which are passed in feces; Develop in soil; Either L3 is ingested by DH; DH ingest L3 through paratenic host; or L3 passed transmammary (T. canis passed transplacentally); Larva undergo extensive somatic migration (remi |
Pathogenesis of Toxocara canis/T. cati | Vomiting or defecting worms; Distended abdomen (pot belly); Colic; Intestinal obstruction or ruptre; May be life threatening in pups |
Toxascaris leonina | Arrowheaded worm |
Toxascaris leonina Adults | Females larger than males; Similar to Toxocara; Small Intestine |
Toxascaris leonina Larva | Small Intestine |
Toxascaris leonina Egg | Egg |