ABSTRACT
The SARS-CoV-2 virus is the cause of COVID-19 disease. The SARS-CoV-2 virus binds to ACE-2 receptors in the human lung via spike protein and causes COVID-19 disease. SARS-CoV-2 virus infection most often leads to the development of severe respiratory conditions, sore throat, and dry cough. By administering the vaccine, the human immune system recognizes the viral antigen, thereby activating immune system cells that produce neutralizing antibodies to remove the viral antigen. To combat the COVID-19 disease pandemic vaccines have been developed. Most commonly used vaccines in Europe are mRNA (messenger ribonucleic acid) vaccines and adenoviral vaccines. In this paper, suspected adverse reactions to the COVID-19 vaccine were analyzed according to patient age, sex, the severity of reporting, severity criteria, type of notifier, reported reaction, and adverse reactions according to the MedDRA classification of organ systems. Analyzed reports of suspected adverse effects were evaluated in the period from 27.12.2020. to 1.7.2021. A total of 2932 reports of suspected adverse reactions to the COVID-19 vaccine were analyzed, of which 730 were considered serious (24.9%). Out of 730 seriously evaluated reports, the largest number of reports refers to the development of other medically significant conditions, 583 of them (70.3%). The largest number of reports relates to the vaccine Comirnaty, 1610 of them (54.9%). This is followed by reports of suspected adverse reactions to Vaxzevria with 1098 reports (27.4%) and Spikevax with 206 reports (7.0%). The lowest number of suspected adverse reactions relates to Vaccine Janssen's COVID-19 vaccine (15;0.5%), while for three suspected adverse reactions the vaccine is unknown (0.1%). 34 cases of suspected adverse reactions, which amounts to only 4.1% of the total number of serious reports, or 1.15% of the total number of all received reports. The most commonly reported reactions to COVID-19 vaccines were fever, headache, and chills.