<prompt> Steatorrhea associated with Giardia infection is seen in which immunoglobulin deficiency ?IgEIgAIgGIgM  <response>: IgA is the secretory antibody prevent gut infection if IgA level are low predispose to Giardia infection. - IgA1 - present in serum - Ig A2 - present in mucosal surface body secretions 