If you have a cold, it is recommended that you withhold the third dose of the New Crown vaccine. It is recommended to withhold the third dose of XKV vaccine because it is contraindicated during an acute attack of a cold. During the acute phase of a cold, the body’s immune system declines, and vaccination at this time may affect the amount of antibodies produced by the vaccine, and may also increase the risk of side effects from the vaccine. It is generally recommended to wait until you have fully recovered from the cold before receiving the third dose of the vaccine. In addition to not being able to receive the third dose of the vaccine during the acute phase of the disease, people who are allergic to the vaccine components are also contraindications to receiving the vaccine. After vaccination, it is necessary to observe the injection site for more than thirty minutes in order to deal with any obvious adverse reactions.