The elderly have relatively low immunity and most of them have basic diseases. They need more care and attention after being infected with COVID-19. When do the elderly need to see a doctor when they have symptoms? What should we pay attention to after infection? Focusing on hot issues of public concern, the State Council's joint prevention and control mechanism organized authoritative experts to give professional answers. Q: How to judge whether the elderly need to see a doctor when they have cough and fever? A: We should strengthen observation for the elderly. Family members should know the basic heart rate, basic blood pressure, basic body temperature and basic respiratory rate of the elderly. If possible, they should also know the basic peripheral blood oxygen saturation of the elderly, especially those with cardiopulmonary diseases. Once infected, it is necessary to observe the changes of these basic data, as well as the state of consciousness, mental state, stool and urine, eating and other aspects of the elderly. Medical treatment should be considered in the following cases: First, symptoms persist or worsen, for example, fever persists or even tends to worsen. The second is the emergence of new symptoms, such as chest pain, dyspnea, incontinence, or sudden inability to move the limbs, especially one side of the limbs, or inability to eat, nausea and vomiting, lethargy, disorientation, disorientation, etc. These are dangerous signals. Third, the basic diseases of the elderly are getting worse, such as angina pectoris in the elderly with coronary heart disease and chronic obstructive pulmonary disease or asthma. More attention should be paid to the elderly with unstable underlying diseases and those over 80 years old who have not received COVID-19 vaccine. Q: For the elderly with limited language expression ability, how can the nursing staff first identify their discomfort symptoms? A: Nurses should understand the common symptoms of COVID-19 infection, including systemic symptoms, such as fever, headache, body aches, chills, and local symptoms, such as sore throat, cough, runny nose, expectoration, sneezing, and even loss of taste and smell. The symptoms of the elderly may not be typical, and their onset may be insidious, with poor mental state, poor consciousness, fatigue, and unwillingness to eat. Some elderly people have a decline in stability, such as walking normally but walking a little shaky recently. These may be clues to infection. When the elderly have the above symptoms, their body temperature should be monitored to detect the temperature rise early. In addition, an unexplained increase in heart rate or respiratory rate may also be a sign of infection. Q: What should the elderly pay attention to in their life and medication after infection? A: After the elderly are infected, on the basis of strengthened observation and monitoring, we should also pay attention to: light diet, it is recommended to eat less and eat more; Ensure sleep; Add proper amount of water. It is recommended to add a small amount of water several times in combination with body temperature and sweating. The elderly should be careful when using antipyretic drugs. The higher the body temperature and the older the person is, the more careful they should be when using antipyretic drugs to prevent the elderly from sweating a lot at one time after using antipyretic drugs, resulting in collapse or even hypotension. The fever should be reduced slowly, and it can be reduced by physical means. In the application of antipyretic drugs, the use of multiple drugs should be avoided. One kind of Chinese patent medicine can be selected. Do not use multiple Chinese patent medicines with the same effect at the same time. If the blood pressure of the elderly with hypertension is lower than the normal level during fever, especially when using antipyretic drugs, the antihypertensive drugs may need to be reduced or even stopped