Ascariasis is a common parasitic infection, particularly in tropical and subtropical regions, with an estimated 800 million to 1.2 billion people infected globally; it should be considered among children newly arrived to Canada. Typically, worms are cleared from the intestine within 3 days, but clearance may take longer depending on intestinal transit time, diarrhea or other host factors.[8] Re-examination of stool specimens may be performed 2-3 months after therapy and patients who remain infected can be retreated.[9] Endoscopic therapy can be considered if medical treatment is unsuccessful (for example, if worms remain for more than 3 weeks, or if the patient has recurrent biliary colic that does not respond to medical treatment). Single-dose therapy with albendazole or pyrantel pamoate is also common; many other variations in medication choice and duration have been reported.[4],[6]-[8] As described in our case, children who are clinically stable, without signs of superimposed bacterial infection, can be managed using medical treatment alone, which is effective in about 60%-80% of cases.[5] For patients with bowel obstruction, oral antihelminthic agents should not be used until motility is restored. [Extracted from the article]