Hepatitis B carriers

are contagious because the virus replicates in the body of a hepatitis B carrier. Determining whether a

Hepatitis B surface antigen

carrier is contagious depends primarily on the degree of replication of the Hepatitis B virus in the liver.

I. Hepatitis B virus carriers are not infectious:

Hepatitis B virus surface antigen

, which does not contain

Hepatitis B virus DNA

, is not infectious in itself.

Two, hepatitis B virus carriers have contagious situation: if the virus replication is active, a large number of viral particles released into the bloodstream, then this hepatitis B surface antigen carriers are highly contagious.