<prompt> True about secondary immune response is -Long latent periodUsually of low titireAntibodies appear in sho timePersist for long  <response>: if an individual who is actively immunized against an antigen experiences the same antigen subsequently, the immune response occurs more quickly and abundantly than during the first encounter. This is known as a secondary response. Reference : Anathanarayan panikers 9th edition, pg no:81,82 p 