A drug which reduces moality but does not cure a disease will gradually lead to
Prevalence = Incidence * Duration of illnessIf the drug reduces moality but cannot cure the disease, duration of illness increases. So, prevalence increases.This drug has no influence on the cause, so incidence remains the same.
Incidence and prevalence both increase
Incidence and prevalence both decrease
Incidence increases while prevalence decreases
Incidence same, prevalence increases
Epidemiology