After vaccination, we should pay attention to the on-site observation for 30 minutes, continuous observation of symptomatic changes, symptomatic treatment of adverse reactions, and timely medical treatment for exacerbation. 1. The main purpose of the 30-minute on-site observation is to prevent serious adverse reactions such as shock and respiratory failure, which can be rescued at the first time to avoid life-threatening situations. 2. Continuously observe the change of symptoms, such as whether there is fatigue, fever, local pain, etc., if there is no normal activities, if there is a need for timely treatment. 3. Symptomatic treatment of adverse reactions, such as fever, generally take physical cooling such as ice packs, local redness and swelling, then take hot compresses, fatigue, then take bed rest, etc., usually can be relieved on their own. 4. Aggravation in time, if the self-treatment of relief is not obvious or even aggravation, you need to consult a doctor in a timely manner, under the guidance of the doctor to deal with.