Effects of Vitamin A Supplementation on Intestinal Parasitic Reinfections

Children from Sekolah Kebangsaan Betau in Pos Betau, Kuala Lipis, Pahang served as the target population for this study. The selection criteria for study subjects were the following: * Age 7-12 years (according to birth date in birth certificate). * Non-menstruating females (age \<13) * No history or evidence of underlying haematological-related diseases such as thalassaemia and ovalocytosis. * No evidence of concomitant severe and/or chronic illness such as acute respiratory tract infections, mental retardation and neurological deficits. * Consent of parent to participate in the study.