The VAERS system is used to collect any data on adverse events. It is important to understand the difference between a side effect and an adverse event. A side effect is any health problem shown through studies, (such as a fever for the COVID-19 vaccine), or unrelated health problems that occur whether the vaccine was administered or not.
An adverse event is a true reaction to the vaccine, such as common known effects and/or allergic reactions. Healthcare providers are required to report certain adverse events following the vaccine administration. The smartphone V-safe app will help check how patients who received the COVID-19 are doing.