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High Levels of Immunoglobulin G (IgG) Antibodies

There are five classes of immunoglobulins: immunoglobulin G (IgG), immunoglobulin A (IgA), immunoglobulin M (IgM), immunoglobulin D (IgD), and immunoglobulin E (IgE).

The immunoglobulin G (IgG) is predominantly involved in the body's secondary (mature) immune response. The IgG class is the smallest and most common type of antibodies in the body and is composed of four different subclasses (IgG1, IgG2, IgG3, and IgG4). Each IgG subclass serves a slightly different function in protecting the body against infection. High immunoglobulin G levels may indicate a long-term (chronic) infection.

In persons with IgG subclass deficiency whose infections cannot be readily controlled with antibiotics, or who have abnormal antibody responses, immunoglobulin replacement therapy may be considered. Infusions of immunoglobulin can be administered either intravenously (IVIg) or subcutaneously (Sub-Q Ig).

Vivaglobin® is the first and only FDA-approved Sub-Q Ig replacement therapy available for patients with primary immunodeficiency disorders. The distribution of IgG subclasses in Vivaglobin® is similar to that present in normal human plasma. Vivaglobin® avoids the high peaks and low troughs associated with serum IgG levels in patients receiving intravenous (IV) therapy and and may eliminate the "wear off" effects experienced by some patients.

Please see full Prescribing Information and Patient Product Information.


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