January is the coldest winter season, low temperatures, dry climate, by the cold air, cold wave attack, the temperature can be a sudden drop, is a period of high incidence of whistling infectious diseases, the public need to focus on the prevention of H7N9 and norovirus infectious diarrhea and other infectious diseases. 1, H7N9 virus Symptoms: people infected with the H7N9 virus, the initial fever, cough, sore throat and other flu-like symptoms, some patients develop rapidly, chest tightness, inspiratory difficulties and other symptoms, the seriousness of the disease can lead to death. Prevention: The public should support the “raw listing” measures, while doing “three to and three don’ts”: three to: wash hands, cook meat, early medical treatment; three don’ts: don’t eat sick or dead poultry, don’t buy birds of unknown origin, don’t eat and sleep in poultry stalls children, pregnant women, the elderly and people with chronic underlying diseases. The elderly and people suffering from chronic underlying diseases, the infection is easy to develop into serious illness, should try to avoid activities in the live poultry market. Because this part of the population is easy to develop serious illness after infection, and even death, so be sure to do a good job of personal protection. 2, norovirus infection diarrhea Symptoms: nausea, vomiting, diarrhea as the main symptoms Infection pathways: such as eating water contaminated by norovirus, food, and norovirus infected people share food, share utensils, so easy in childcare institutions, schools, hospitals, homes for the elderly and other collective units outbreak. Prevention: People should develop good personal hygiene habits, wash their hands before and after meals, and disinfect dishes regularly. Schools, child care institutions and other collective units should do the following preventive and control measures: (1) toilets are equipped with sufficient soap or hand sanitizer (2) public places (such as toilets, classrooms, cafeterias, etc.) and key links (such as door handles, elevator buttons) should be cleaned and disinfected diligently; (3) cafeteria staff should wear masks and gloves when handling food, and wash and disinfect kitchen utensils and tableware in a timely manner after handling; strengthen health education such as diligent hand washing. (4) Do a good job in the morning and afternoon check-up system, the registration and tracking system of absenteeism due to illness, and immediately report to the local disease control agencies and relevant administrative departments when an abnormal increase in vomiting, diarrhea and other cases of acute enteritis is detected; (5) Teachers and students should seek medical attention in a timely manner when symptoms of vomiting and diarrhea appear, and should not go to work (class) with illness. 3. Chickenpox Transmission route: mainly through airborne droplets or close contact, easily spread in crowded schools and childcare institutions. Preventive measures: Schools and child care institutions should strengthen morning and afternoon checks, early detection and isolation and treatment of sick students. Chickenpox can be prevented by getting vaccinated against chickenpox. In addition, it is also necessary to develop good hygiene habits, maintain good indoor ventilation, enhance nutrition and minimize visits to crowded places with poor ventilation. 4. Influenza virus Symptoms: Influenza is mainly spread through air and contact, often with sudden onset of high fever, cough, sore throat, runny nose, headache and other symptoms. Influenza prevention: wash hands and ventilate frequently; go to crowded and poorly ventilated places as little as possible; enhance physical fitness and self-care; the elderly, children and the frail can go to vaccination clinics for influenza vaccination.