Question

Which antibody class is the first to be produced during an immune response to pathogens?

Options

• IgE

• IgA

• IgG

• IgM

Answer 1

IgM is the first antibody produced during an initial immune response to pathogens. Although it comprises only ~7% of serum, IgM plays a crucial role in the early stages of infection by activating complement proteins and triggering the elimination of pathogens before IgG production ramps up.