immune response primary

immune response primary
the immune response occurring on the first exposure to an antigen. After a lag or latent period of from 3 to 14 days depending on the antigen, specific antibodies appear in the blood. There is a peak of IgM production lasting several days followed immediately by a peak of IgG production. Antibody production ceases after several weeks, but memory cells remain in circulation.

Medical dictionary. 2011.

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