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Other / Epidemiology and disease control

Research further on the step study, the step vaccine clinical trials, and their parameters.

research further on the STEP study, the STEP vaccine clinical trials, and their parameters.
Based on your research, understanding, and above information, answer the following questions:
Prior to beginning this study, how would you have described the risks and benefits of the study to participants?
What are the ethical issues surrounding this study at the beginning and when the decision was made to terminate the study?