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Bulletin No. 15 - Summer 2003
Parasitology- No Category
VERCRUYSSE J AND GEURDEN T.
A. suum diagnosis.
Pig Progress, June 2003: 18
Diagnosis of A. suum infection is accomplished by findings of high fecal egg counts (>10,000) in pigs over 10 weeks of age. Piglets are protected by colostral antibodies for about 3 weeks, and then patency requires about 6 weeks after ingestion of embryonated eggs. It is recommended that at least 10 litters of piglets be sampled and examined in the laboratory for eggs. Egg counts <200 EPG are considered false positives, caused by coprophagia. False negatives may be due to immaturity of the infection, or to the pigs developing immunity. As few as 30% of infected pigs may be positive for fecal eggs. White spots on the livers of slaughtered pigs are indicative of recent exposure to infective material.
