Prevalence is less than incidence 1) Disease is very fatalMost of the cases die, so at the time of calculating prevalence the number is usually less than the incidence.2) Disease is very well curable either by rapid recovery or by treatmentMost of the cases recover, so at the time of calculating prevalence the number is usually less than incidence.Prevalence is more than incidence 1) Disease is not fatal but very chronicDue to increased duration, prevalence increases2) Treatment prevent death but does not cureDue to increased duration, prevalence increases.