Hepatitis B 2, 4 and 5 positive, that is, hepatitis B surface antibody, hepatitis B e antibody and hepatitis B core antibody, these three positive indicators suggest that the body has a very good immunity against hepatitis B virus, and will not be infected with hepatitis B virus again, generally have lifelong immunity against hepatitis B virus, because the immunity against hepatitis B has the function of memory, and once the surface antibody is present, it suggests that there is lifelong immunity against hepatitis B virus. The 2nd, 4th and 5th items are positive, this kind of people mainly have been infected with hepatitis B virus, but the body has cleared the hepatitis B virus and acquired surface antibody, this kind of surface antibody can play a very good role in immunity against hepatitis B virus, once the hepatitis B virus invades the body again, the surface antibody of hepatitis B of the body will quickly neutralize the hepatitis B virus. Moreover, hepatitis B surface antibody has the function of memory, once the titer of surface antibody decreases, when encountering the invasion of hepatitis B virus again, it will stimulate the body to produce more hepatitis B surface antibody rapidly.