Precautions within 1 week after vaccination are common in the following aspects: 1. After vaccination, the vaccinees need to stay in the same place for 30 minutes to avoid acute allergic reactions and leave only after there is no abnormality. If there is any discomfort during the observation period, medical staff should be reported immediately for consultation and treatment; 2. 4. Like other vaccines, some vaccinees may have minor adverse reactions after receiving the vaccine, mainly manifested as mild pain, redness and swelling at the injection site, or nausea, fever, headache, muscle pain, diarrhea, etc. The symptoms are generally mild and do not require special treatment. If serious adverse reactions occur after vaccination, please seek medical attention and report the situation to the vaccination unit; 5. The current vaccination program is generally 1-3 doses, and vaccinees who have been vaccinated should pay attention to completing all vaccinations in strict accordance with the vaccination schedule and not to change the vaccination program at will, so as not to affect the immunity, safety and durability of the vaccine.