If the prevalene is very low as compared to the incidence for a disease, it implies -

Prevalence is less than incidence 1) Disease is very fatal Most 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 treatment Most 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 chronic Due to increased duration, prevalence increases 2) Treatment prevent death but does not cure Due to increased duration, prevalence increases.