It is possible to get chickenpox again after getting the chickenpox vaccine. It is not true that the chickenpox vaccine can prevent chickenpox 100%, after taking a chickenpox vaccine, some people will not get chickenpox in the near future, but some people will get chickenpox because the chickenpox vaccine does not prevent chickenpox. But even if this is the case, it does not mean that the varicella vaccine is completely ineffective. Because of such a situation and then get chickenpox, it is likely that because of the previous chickenpox vaccine on the body’s immune effect, so that the body’s immune system has a certain amount of memory, and the condition of the chickenpox again, it is likely to be less severe than when not injected with the chickenpox vaccine. Therefore, if you have chickenpox after taking the chickenpox vaccine, the chickenpox vaccine you took before is not completely invalid. Of course, the more satisfactory result of chickenpox vaccination is that you will not get chickenpox again. Therefore, in cases where only one dose of chickenpox vaccine has been given, it is recommended that a booster shot be given instead, so that more people can be prevented from getting chickenpox again.