Antibodies refer to one or more types of immunoglobulins produced by the body’s immune system in response to the corresponding antigen. Rubella virus antibodies can be categorized into IgG and IgM, both of which are obtained through a blood test. If you are positive for IgG antibodies to the rubella virus, you may have been infected with rubella before, or you may have been vaccinated against rubella before, and positive IgG antibodies indicate that you have acquired immunity against rubella. If you are currently in the middle of a rubella disease, IgG antibodies may also be elevated, but they will be more than four times higher during the infection versus the recovery period. A positive IgM antibody to the rubella virus indicates that the person is currently infected with the rubella virus. These are the two main types of rubella antibodies.