Veterinary Epidemiology and Zoonosis

LONGITUDINAL STUDIES

• Longitudinal studies are two types, which are
  • Case control study
  • Cohort study
• In longitudinal studies, the observations are repeated in the same populations over prolonged period of time. It is useful to
  • Know the natural history of the disease and its future outcome.
  • To identify the risk factors involved.
  • To know the incidence rate.
• Longitudinal studies are difficult to organize, expensive and time consuming.