Since anaphylaxis usually occurs within 30 minutes of vaccination, it is usually recommended to stay under observation for at least 30 minutes after vaccination to avoid symptoms such as anaphylactic shock, which can easily lead to life-threatening situations outside the detection range of medical personnel. Most people who leave without observation after vaccination do not develop dangerous conditions. However, in a few cases, once anaphylaxis or laryngeal edema occurs, it can be life-threatening because these two allergic conditions are emergencies and resuscitation requires a race against time. If you have already left the hospital and the above situation occurs, and then return to the hospital, it is usually too late and you can easily lose your life as a result. Therefore, it is usually required to stay in the observation room for 30 minutes after vaccination in order to prevent the emergence of the above mentioned critical situations. During the period of observation, it is necessary to pay attention to whether there are signs of anaphylactic shock such as high fever, cold limbs, fainting, cyanosis of lips and lips, skin blotchiness, etc., and also pay attention to whether there are signs of severe allergy such as chest tightness, breathlessness, respiratory distress, allergic rash, angioneurotic edema, laryngeal edema, etc.. Once there are uncomfortable symptoms, it is necessary to report to the doctor in time. After leaving the hospital, patients should pay attention to rest, avoid strenuous exercise, keep the injection area dry and hygienic, avoid getting wet to avoid secondary bacterial infection. Drink plenty of water, and eat a light and digestible diet.