Why is baygam usually prescribed?

BayGam Indications: Baygam is a brand name for human immune globulin, a rich source of antibodies. It is usually given to persons exposed to certain viruses such as measles, hepatitis a, chickenpox where the person has no prior infection with the virus and are hi risk for complications due to their age or presence of a weakened immune system.

Baygam: Immune globulins, this a medication that contains natural antibodies, given for passive protection if a patient wasn't exposed before to a viral disease such as chicken pox,(not all cases) or to replace naturally manufactured antibodies in some patients who have immunodeficiency diseases,(not able to produce their own antibodies). Different dose regimens for different cases, hope this helps