First immunoglobulin to appear following infection -: (A) IgG, (B) IgM, (C) IgA, (D) IgE
Answer is B. IgM is a heavy molecule. - IgM molecules are polymers of five four-peptide subunits. IgM is relatively sho-lived - hence their demonstration in serum indicates recent infection. ReReference:nathanarayan & paniker's 9th edition, pg no: 98 <\p>