Gamma globulin is a plasma protein, a component of blood serum that contains antibodies.
Gamma globulin can be extracted from the blood of a person who is immune to a certain infection and injected into another person who has been exposed to the disease (hyperimmune globulin).
These extracts can provide temporary immunity to infectious hepatitis, rubeola (measles), poliomyelitis, tetanus, yellow fever, or smallpox.
Gamma globulin injections do not seem to be of much benefit against mumps or rubella (German measles).
There is a serious risk of infection if a person has a low level of gamma globulin.
For example, in a rare, inherited disorder called agammaglobulinemia, there is almost no gamma globulin in the blood. Infections of all kinds occur more often and are more serious.
Decreased gamma globulin levels sometimes result from the treatment of leukemia or cancer by chemotherapy. The only treatment in such circumstances is regular doses of gamma globulin.

Immune globulin Rh0 (D)

Special preparation of gamma globulin, Rh0 (D) immune globulin, is given to a mother who has Rh- (Rh negative) blood after she has given birth.