Hello dear
Warm  welcome to Healthcaremagic.com
I have evaluated your query for your son in details  .
*  This is in relation with intestine infection .
*  Guidelines for  better  recovery
-  Give him plenty of liquids preferably boiled water , coconut water .
-  Prefer soft , light diet .
-  Avoid all oily , spicy , non veg , junk foods .
-  Definitely  requires  antibiotics  with 
metronidazole on pack , pro biotics
    as  lacto bacillus for faster  recovery .
Hope this will help you for sure .
Wishing  him  fine recovery  & a very happy journey to Canada .
Feel  free  to ask any further doubts .
Regards  .