IgG

IgG or immunoglobulin G (gamma globulin) anti­bodies remain in the body for long periods of time after infection. And they are the most common type, comprising about 80 percent of the body’s total immunoglobulins. They are in the serum and are produced in substantial quantities during the secondary immune response, and along with IgM activate the complement system, which results in the destruction of the membrane of pathogens. The IgGs act by agglutinating, by opsonis- ing, by activating complement-mediated reactions against cellular pathogens, and by neutralizing toxins.