There is still a risk of contracting New Crown after three vaccinations. The new crown vaccination is to increase the titer of protective antibodies in the body to prevent infection with the new crown vaccine, but no vaccine can completely eliminate the effect of infection. Due to the mutation of the virus or the decline of the patient’s own resistance, even after three doses of the vaccine, the possibility of contracting the virus in exposed environments cannot be ruled out. Therefore, after the three shots of vaccine, individuals should also do a good job of protection, do not go to places where people gather unless necessary, and should keep a safe distance from people in public places and wear a good mask. If you find that you have fever or other physical symptoms, you must go to the hospital in time to identify the cause of the disease, and under the guidance of the doctor to do nucleic acid testing to rule out the new coronavirus infection.