Clinical Trials: Essential Stage in Development of Drug.

This article gives an idea about the clinical trials and way its importance in the development of the vaccine. The different phases which are involved in clinical trials like phase I, phase II, phase III, and phase IV. Each phase role in the development of vaccines and how clinical trials play an important role in the treatment of various diseases. The role of a clinical trial is to help society and the entire medical community by contributing to the research and development of new drugs concerning their safety and efficacy. [ABSTRACT FROM AUTHOR]