Predominant class of immunoglobulin during primary immune response is -: (A) IgA, (B) IgE, (C) IgM, (D) IgG
Answer is C. IgM antibodies appear early in the course of an infection and usually reappear, to a lesser extent, after fuher exposure. Ref: Ananthanarayan & Parkers textbook of microbiology 9th edition pg:98