Infectious disease prevention knowledge: a. When sneezing or coughing in crowded places, use handkerchiefs or tissues to cover your nose and mouth, do not spit anywhere, and do not throw away the handkerchiefs used when spitting or blowing your nose. Wash your hands regularly and do not use dirty towels to wipe your hands. Hands should be washed or wiped immediately after contact with respiratory secretions. Avoid sharing water cups, tableware, towels, toothbrushes and other items with others. V. Pay attention to environmental hygiene and indoor ventilation, such as when there are patients with respiratory tract infectious disease symptoms around, the number of ventilation should be increased. When opening windows, avoid the wind through the hall, pay attention to keep warm, clothes and bedding should be often exposed to the sun. Drink more water and eat more vegetables and fruits to increase the immunity of the body. Avoid going to public places where many people gather.