Generally, 3 doses of recombinant novel coronavirus vaccine are required, and it is recommended that the interval between 2 adjacent doses be greater than 4 weeks. The second dose needs to be completed within 8 weeks after the first dose, and the third dose needs to be administered 4 weeks after the second dose, but must be completed within 6 months after the first dose. Most people have good safety after vaccination. A few people may have mild to moderate adverse reactions, such as redness, swelling, pain and hard nodules at the vaccination site, but they can generally recover in about 1-3 days. After vaccination, it is recommended to ensure sufficient rest, avoid staying up late or overworking, drink more water, consume a light, easily digestible diet and fresh fruits and vegetables to help strengthen resistance, and avoid eating spicy, stimulating, cold diet or smoking or drinking alcohol. Avoid strenuous exercise, bathing, swimming, sauna and other activities on the day of vaccination to prevent infection at the vaccination site. Vaccination does not mean that you are completely immune to the new coronavirus, and you need to protect yourself. Wear a mask when going out to public places and do not stay in high-risk areas. Wash your hands and disinfect after contact with the outside environment and objects. Keep windows open at home to keep indoor air flowing and reduce bacterial levels, and disinfect regularly. In case of persistent high fever, cough, chest tightness and weakness, it is recommended to consult a doctor as soon as possible and undergo isolation examination and treatment according to the regulations of the epidemic prevention department.