How many days can the second needle of second liver vaccine delay to hit at most

Check that there is no hepatitis B surface antibody in the body, so it is necessary to inject hepatitis B vaccine in time. If the first injection has been completed, the second injection should be injected at an interval of one month. If abnormal conditions such as physical discomfort occur, the second injection can be postponed for about one week. It is not recommended to delay too long, otherwise it is necessary to re-inject hepatitis B vaccine.