ABSTRACT
The study was conducted in 300 people above 16 year old in Yen Phong district, Bac Ninh province from December 2003 to June 2004, using cross-sectional descriptive method and data processed by software EPI-INFO 6.04. Results: 19% of ancylostomiasis infected, 38.6% of anaemia; a hypoglobulia occurred at mild level in 80% of male and 62.2% of female, at medium level in 20% of male and 16.2% of female, and no cases at severe level. Hemoglobin level reduced lightly in 50% male; 32.4% female and no cases at severe level. After 4 weeks of treatment with mebendazol 500mg, the rate of patients without any larvae account for 91.2%. After 6 month of the treatment, almost patients had erythrocyte value and hemoglobin level close to the normal. After 6 months, the recurrent rate was 15.8%