Which of the following can cause an increase in the prevalence of the disease -

Derived Factors that increase Prevalence Prevalence increases with addition of diseased people (immigration) Prevalence increases with subtraction of healthy people (emigration) Prevalence increases with prolongation of life in chronic diseases Prevalence increases with decreased death rate amongst diseased Derived Factors that decrease Prevalence Prevalence decreases with addition of healthy people (immigration) Prevalence decreases with subtraction of diseased people (emigration) Prevalence decreases with increased cure rates Prevalence decreases with increased death rates Prevalence decreases with preventive programs such as immunization (which prevent new cases from occurring).