<prompt> Most abundant immunoglobulin present in breast milk?IgAIgMIgGIgE  <response>: Most abundant type of Ig IgA IgD IgG, IgM IgE Anti-infective factors present in breast milk are: IgA ratio of IgA: IgG is 100:1 Lymphocytes Anti- streptococcal factor Lysosome Lactoferrin Living cells. 