University of Rochester Medical Center scientists have been heavily involved in vaccine trials, so we have a good sense of how these vaccines were developed and how safe they are. While it’s true that they were developed much more quickly than past vaccines, they were still subject to large trials and strict review by independent scientists.
The process moved quickly in part because groundwork had already been done on vaccines for other, similar coronaviruses, meaning parts of the process that could otherwise have taken years were already completed. In addition, trials were combined and manufacturing began before the trials were done. "However, no steps were skipped and safety remained a top priority," said Angela Branche, M.D., who co-directs URMC’s Vaccine and Treatment Evaluation Unit where she has led research on many of the first coronavirus vaccines to be distributed. "More than 100,000 volunteers were injected with the vaccines to ensure they would not cause significant adverse effects."
Read more about coronavirus vaccine safety.