2. Generally, it is counted from the completion of the whole vaccination, that is to say, if it is a two-needle COVID-19 vaccine, its validity period should be counted from the end of the second needle, and if it is a three-needle COVID-19 vaccine, its validity period should be counted from the end of the third needle.

3. In clinical trials, the validity period of COVID-19 vaccine can reach more than six months. However, because COVID-19 vaccine is not widely used in clinic, the specific validity period is still inconclusive.

4. But at present, COVID-19 vaccine is an ideal method to prevent COVID-19 infection, with high safety and relatively small probability of side effects. Therefore, if people have no contraindications, it is recommended to vaccinate COVID-19 Crown Vaccine.

5. Before vaccination with COVID-19 vaccine, the vaccinators should be evaluated. If there are contraindications, it is impossible to get COVID-19 vaccine. After vaccination in COVID-19, you should pay attention to your diet and observe whether there are any side effects.