Vaccine safety is always a top priority, and this is no different for COVID-19 vaccines. All vaccines go through clinical trial phases before they are approved for use in the population. These trials aim to ensure the safety and ability of the vaccine to protect against the disease (efficacy).
The vaccines that are being developed against COVID-19 are following these same phases. COVID-19 vaccines will not be approved or introduced in countries for use in the general population until their safety has been proven to regulatory agencies. Likewise, WHO will not grant an Emergency Use Listing until it has analyzed all of the trial data. After COVID-19 vaccines are approved, monitoring for safety continues. This monitoring is a normal part of immunization programs and is done for all vaccines.