One of the five classes of immunoglobulins; widespread in the body, it provides long-lasting defense against most bacterial invasions and other antigens.
![Immunoglobulin G (IgG)](https://www.labtestsguide.com/wp-content/uploads/2019/12/IgG.jpg)
Immunoglobulin G (IgG), the most abundant type of antibody, is found in all body fluids and protects against bacterial and viral infections.
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