Currently there is no specific deadline for the number of days to delay the third dose of the New Crown vaccine. The general official recommendation is to do it as soon as possible within the specified time frame. The third dose of the new crown vaccine needs to be completed as soon as possible, six months after the second dose, and if it is delayed for some reason, it needs to be replenished as soon as possible at a later stage. If there is a delay, the vaccine needs to be given as soon as possible. However, there is no specific time limit, and it is possible to get the third dose as soon as possible, although the results are not as good as if the vaccine is given within the time limit. New crown vaccine three shots, the second shot is usually about a month after the first shot, not more than two months; the third shot should be more than one month after the second injection interval, and within six months of the first injection, it is recommended to follow the prescribed time for vaccination, so as to produce a good preventive effect. If the vaccination is given during an attack of another disease, the third dose of the vaccine may be withheld in this case. If there is a serious adverse reaction or allergic reaction to the first dose, the second or third dose may be withheld.