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Presence of Immunoglobulin G (IgG) Antibody

Immunoglobulin G (IgG) is a monomeric immunoglobulin that is predominantly involved in the body’s secondary antibody response to an antigen. This means that the presence of specific IgG generally corresponds to maturation of the antibody response.

IgG antibodies are very important in fighting bacterial and viral infections. Patients who suffer recurrent infections because they lack, or have very low levels of, one or two IgG subclasses, but whose other immunoglobulin levels, including total IgG, are normal, are said to have a primary immunodeficiency disorder (PIDD) known as "selective IgG subclass deficiency". For patients with IgG subclass deficiency whose infections cannot be readily controlled with antibiotics, or have abnormal antibody responses, immunoglobulin replacement therapy may be considered.

Vivaglobin® is the first and only FDA-approved subcutaneous (Sub-Q) immunoglobulin (Ig) replacement therapy available for patients with primary immunodeficiency disorders. Vivaglobin® is supplied as a sterile liquid 16% (160 mg/mL) protein solution with a content of at least 96% immunoglobulin G (IgG). The distribution of IgG subclasses is similar to the presence of IgG antibody in normal human plasma.

The recommended weekly dose of Vivaglobin® is 100 mg/kg to 200 mg/kg body weight administered subcutaneously. Doses may be adjusted over time to achieve the desired clinical response and serum IgG levels. As there can be differences in the half-life of IgG among patients with primary immunodeficiency disorders (PIDD), the dose and dosing interval of immunoglobulin therapy may vary. When administered on a weekly basis, Vivaglobin® provides consistent, steady-state serum IgG levels without "wear off" effects.1,2

Please see full Prescribing Information and Patient Product Information.

References:

  1. Nicolay U, Kiessling P, Berger M, et al. Health-related quality of life and treatment satisfaction in North American patients with primary immunedeficiency diseases receiving subcutaneous IgG self-infusions at home. J Clin Immunol. 2006;26:65-72.
  2. Ochs HD, Gupta S, Kiessling P, et al. Safety and efficacy of self-administered subcutaneous immunoglobulin in patients with primary immunodeficiency diseases. J Clin Immunol. 2006;26:265-273.

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