Veterinary Epidemiology and Zoonosis

INTRODUCTION

• Sampling is done by surveys, in which information on diseases in the population and associated events such as productivity can be obtained.
• It involves counting members of an aggregate of units and measuring their characteristics.
• It is conducted to estimate either a continuous variable(s) (Examples: milk yield, weight etc.) or discrete event(s) (Examples: diseased animals).
• The main application of survey is the estimation of the prevalence of clinical disease, infection and seropositivity in animal populations.
• The sample survey involves,
  • Single sample to determine the prevalence
  • Two samples to compare prevalence