A hepatitis B carrier is contagious because a hepatitis B carrier is a person with hepatitis B. The hepatitis B virus is present in the blood of a person with hepatitis B. It is possible to transmit the virus through the blood route, and other routes are also possible, but less likely than blood. The reason why hepatitis B virus carriers are the same as hepatitis B patients is that carriers simply mean that the virus has not caused damage to the liver and other organs, which does not mean that the amount of hepatitis B virus in the blood is relatively small. Some carriers are even more infectious than those with chronic hepatitis B. Because virus carriers are in a state of immune tolerance, they tend to be major triplets with higher viral levels, and when there is immune clearance, that’s when the damage to liver function occurs and the immune system starts to clear some of the virus, and that’s when the major triplets tend to become minor triplets, and the amount of virus in the blood drops and becomes less contagious. So hepatitis B carriers are contagious, and potentially more so than those with chronic hepatitis B.