Abstract

Less than two years after the COVID-19 epidemic, several vaccine candidates received emergency use permits in a wide range of countries. During public vaccination, diversity in the target groups, the presence of people with underlying diseases and vaccination of a large number of people in a short period of time will lead to an increase in the probability of complications due to vaccination compared to normal conditions. To date, no evidence of a cause-and-effect relationship between the administration of the COVID-19 vaccine and mortality has been reported in the literature. Also, the side effects of injectable vaccines have not been widely observed in recipients. However, some vaccine recipients have experienced complications such as gastrointestinal disorders, skin allergies, and even platelet clots. For example, only a few cases of anaphylaxis have been reported after receiving Pfizer-BioNTech and Moderna COVID-19 vaccines. Health authorities recognize that all of authorized COVID-19 vaccines can cause side effects. In general, the researchers believe that the benefits of the COVID-19 vaccination outweigh the side effects of these vaccines. In this review, we summarize the most important side effects known during the injection of 8 approved vaccines for COVID-19. The points presented will lead to providing effective knowledge about the risks that researchers are still investigating.