New crown vaccination interval usually refers to the interval between different doses of the two-dose and three-dose vaccinations. Usually, an interval of 90 days between doses of New Crown vaccination is useful. If some people delay vaccination due to personal circumstances, the interval of 90 days can also be made up after consultation with a doctor. New crown vaccination stimulates the body to produce immune antibodies against the new crown virus through vaccine preparation injection, and multiple injections stimulate the body with immunity in multiple doses on the basis of one injection, and the overall effect of immune response strength is better. However, the multi-dose vaccine also has its drawbacks. After the first vaccination, the immunity against the virus in the body will gradually weaken, and the next vaccination is needed in time to produce sufficient antibodies. Patients who receive the New Crown vaccine at an interval of 90 days may be at risk of infection if they exceed the recommended interval for the New Crown vaccine. However, at this time, the New Crown vaccine still has an immunizing effect and can stimulate the body to produce antibodies to the virus through a catch-up vaccination, although it may be slightly less effective than a full vaccination within the recommended time. Clinically, the second dose of New Crown vaccine is usually inactivated, and the second dose of vaccination should be given within 8 weeks (56 days) in order to have a good effect. It is recommended that the second dose be completed within 8 weeks after the completion of the first dose, and the third dose be completed within 6 months after the first dose, and the interval between the two doses should be ≥4 weeks. Due to individual differences, the interval between different vaccines varies and the effect on the patient’s organism varies. If you do not complete the vaccination program on time due to work or other objective reasons at an interval of 90 days, it is recommended that you inform your doctor and promptly complete the vaccination program, usually without restarting the immunization program.