A Trial of the Pharmacokinetics, Safety, and Tolerability of Subcutaneous Gamunex® in Primary Immunodeficiency

This is an open-label, single-sequence, multi-center trial with subjects previously diagnosed with primary immune deficiency. Subjects will be on IGIV until a steady state is reached at which time PK profiling during the IV phase will occur. Subjects will begin SC administration 1 week following last IV dose and followed for a period of six months. PK profiling in SC phase will occur when subject reaches approximate steady-state on SC administration.