True about Propagated epidemic is following Except
Secondary waves are absent
Spreads from person to person
The speed of spread depends upon Herd immunity
Shows gradual rise and fall over long period of me
A propagated epidemic is most often infectious origin and results from person to person transmission of an infectious agent.The e[idemic 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
Epidemiology