IgM (Immunoglobulin M)

IgM, or Immunoglobulin M, is a type of antibody produced by the immune system in response to infections. It is the first antibody to appear when the body encounters a new pathogen, helping to quickly identify and neutralize the threat. IgM is primarily found in the bloodstream and lymphatic fluid, providing an early defense before other antibodies, like IgG, are produced. Its presence indicates a recent or ongoing infection, and it plays a crucial role in activating other parts of the immune response to protect the body.