<prompt> All of the following interaction occurs between antigen and antibody ExceptIonic bondCovalent bondHydrogen bondVanderwalls forces  <response>: The primary stage reaction of antigen and antibody is reversible ,this combination being affected by weaker molecular forces like vanderwaals forces,ionic bonds,and hydrogen bonding, rather than by the firmer covalent bonding. Ref: anantnarayan and panikers 10th edition 