Which immunoglobulin is the first antibody produced during the initial exposure to an antigen?

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Multiple Choice

Which immunoglobulin is the first antibody produced during the initial exposure to an antigen?

Explanation:
During a first exposure to an antigen, the body mounts a primary immune response in which naive B cells first produce IgM. IgM appears early because it is the default isotype before class switching; it’s often a pentamer, which helps with strong initial binding and activating complement. Over time, B cells switch to other isotypes like IgG, IgA, or IgE depending on signals from helper T cells and the infection site, so IgG is typically produced later for long-term systemic immunity, while IgA and IgE serve more specialized roles.

During a first exposure to an antigen, the body mounts a primary immune response in which naive B cells first produce IgM. IgM appears early because it is the default isotype before class switching; it’s often a pentamer, which helps with strong initial binding and activating complement. Over time, B cells switch to other isotypes like IgG, IgA, or IgE depending on signals from helper T cells and the infection site, so IgG is typically produced later for long-term systemic immunity, while IgA and IgE serve more specialized roles.

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