Qing Xu, chief of the Disinfection and Vector Biology Department of Nanjing CDC, said that houses and environments flooded by floods should be disinfected by project and environment before moving in, because there will be many kinds of bacteria and virus residues. First of all, we should clean the house, remove the garbage inside and outside the house and the dirt on the furniture surface, open the window for ventilation and reduce the indoor air humidity; Secondly, use chlorine-containing disinfectants, such as "84" disinfectant, chlorine dioxide, peracetic acid, etc. Stick it on the wall, desktop and floor according to the instructions, then wipe or spray it to remove the bacteria or virus on the surface, and then scrub it with clean water after half an hour, once a day/kloc-0, usually about 3 times. For submerged tableware, tea sets and other edible utensils, clean them first, and then boil them for disinfection, preferably for more than half an hour; For heat-resistant instruments, the "84" disinfectant can be used for soaking and disinfection according to the instruction manual. It is worth noting that soaked food and spoiled and moldy food can no longer be eaten. For bedding and clothes soaked in water, you can clean them first and then expose them to the sun. If possible, you can use a disinfectant laundry detergent and wait until it is dry. For rural areas without tap water, we must pay attention to drinking water hygiene. After taking water, we can put 1 bleaching tablets in every 50kg of water, stir and let it stand for about half an hour before use. Be careful not to drink raw water and eat cold food. Because there are many opportunities for pollution after the disaster, individuals must pay attention to washing their hands frequently, and do not grab food directly with their hands to prevent diseases from entering the mouth. Regarding the external environment where he lives, Xu said that it is mainly to strengthen the "three defenses" against flies, mosquitoes and mice. After the flood, it is necessary to repair the screen doors and screens damaged by water in time, and use insecticidal spray, mosquito repellent incense and other mosquito repellent indoors. Xu said that dusk is usually the mating time of mosquito group dance, and the density and phototaxis of mosquitoes are the highest. At this time, it is best not to open doors and windows, or light mosquito-repellent incense at the door to repel mosquitoes to prevent mosquitoes from entering the house when people enter and leave. Secondly, because the flood flooded the hiding places of rats in low-lying areas, they moved to places where human activities were carried out, and the chances of being spread by rats increased. Members of the public should promptly repair possible caves in their houses to prevent rats from sneaking in. They can also use rodenticides such as Dalong and Bromadiolone to kill rats, but they must pay attention to safety. (Fan Huafeng, Yu Dandan)