Abstract
The COVID-19 pandemic will subside only through the emergence and distribution of an efficacious vaccine. The two main aspects that should be maintained in equilibrium: the dire necessity for speedy vaccine research and the need for safeguarding the research subjects, which is of utmost concern in research ethics. This opens up a discussion of what norms to follow during the clinical trials while developing the vaccine. As of now, various companies like Moderna, Pfizer, University of Oxford, Astra-Zeneca and so on have moved beyond the safety, efficacy and immunogenic studies. This narrative review explores and discusses the key principles of ethics: a principle of autonomy, beneficence, non-maleficence, and justice along with its ten general expanded principles. Furthermore, it delves into the different types of vaccines, their mechanisms, side effects, limitations, and advantages.