STUDY ON KNOWLEDGE AND PRACTICE TO PREVENT WORM INFECTION IN NAM DINH 2013 This was a cross - sectional descriptive study on knowledge and practice to prevent worm infection among residents at Mytan commune in Namdinh in 2013. Results showed that: 19.1% of people indicated three kinds of intestinal worms; 56.8% of them knew only 1 type of worm and still having 2.5% of subjects did not know any kind of worm.