<prompt> True about Propagated epidemic is following ExceptSecondary waves are absentSpreads from person to personThe speed of spread depends upon Herd immunityShows gradual rise and fall over long period of me  <response>: A propagated epidemic is most often infectious origin and results from person to person transmission of an infectious agent.The eidemic usually shows a gradual rise and tails off over a much longer period of time.The speed of spread depends upon herd immunity, oppounities for contact and secondary atttack rate.Park 23e pg: 65 