Hi Thanks for posting on HCM Persistence of diarrhea on flagyl and erceflora may suggest the cause is not amoeba or may be a co-infection of amoeba and another intestinal bacteria or parasite.Other causes may include: extradigestive viral/bacteria infections, lactose lactose intolerance. I will suggest you see the Doctor for a stool culture/sensitivity test as a course of antibiotics may be needed. You may try the following: -Give the child oral rehydration salt to replenish ions lost in diarrhea -Zinc tablets to help repair intestinal mucosa -Stay away from sugar/sweetened fluids If the child is too dehydrated, hospitalization and IV fluid replacement may be considered by your Doctor. Hope my answer will help you Best wishes