3.Objective: The main objectives of the proposed study is to compare the relative efficacy of two different ante-helminthic treatment regimens to reduce the prevalence of STHI, diarrheal diseases, respiratory illness and to improve nutritional status in children 4. Design: The population of the study will be preschool children aged 2-5 year and will be selected randomly from an urban of Dhaka. They will be divided into two groups randomly. One group will get ante-helminthic at every three months interval and the other groups will get at six months interval for one year. Stool samples will be collected at the baseline and after three months completing one-year treatment of the above mentioned regimen. Blood haemoglobulin and nutritional status will also be measured at baseline and after three months of completion of treatment as mentioned above. The treatment will be 400 mg of Albendazole in a single dose.