The study subjects were divided into 4 groups for different interventions: 1) Control group (CTR, n=73), had no deworming and no micronutrient supplementation; 2) Merely dewormed group (TG, n=70), children with worm infection, received 1 dose of Mebendazole 500 mg at the beginning of the study; 3) Merely micronutrient supplemented group (ĐVC, n=72), had no deworming, received daily micronutrient supplement; 4) Combined deworming and micronutrient supplementing group (TG+ĐVC, n=69), received 1 dose of Mebendazole at the beginning and daily micronutrient supplement in 6 months.