In terms of the latter, there is an increase in knowledge of DHF transmission mechanism (83.6 - 96.7%), sign of DHF (74.3 - 85.5%), practice of putting salt into miscellaneous containers (22.9 - 46.1%), collecting waste materials (43.3 - 71.1%), pouring the stagnant water off the drip tray of the refrigerator (30 - 44.1%), using bed nets for all day and night (68.8 - 84.2%).