Propagative epidemic, transmission is -
Person to person
Animal to person
Water to person
Fomite to person
.a propagated epidemic is usually of infectious origin.its mode of transmission is from person to person always.the epidemic usually shows a gradual rise and tails off over a much longer time.transmission continues untill the number of susceptibles depleted.the speed of spread depends upon herd immunity ,oppounities for contact and secondary attacks rates.occur commonly in aggregated populations. ref:park&;s textbook,22 nd ed,pg 63
Epidemiology