Some Problems of Vaccination Campaigns in Developing Countries

Vaccination offers the most cost-effective approach to prevent and control infectious diseases in the history of mankind.1 The English physician Edward Jenner introduced smallpox vaccine in 1798. It is the first successful vaccine to be developed. Since then a series of vaccines have been developed and come into use; for example, the influenza vaccine, the hepatitis B vaccine, and the polio vaccine. The World Health Organization (WHO) reports that licensed vaccines are currently available to successfully combat against twenty-five infections.2