The largest global study on the safety of Corona vaccines found that there is a slight association between receiving vaccinations and an increased likelihood of developing some health problems related to the nerves, brain, and heart. According to Bloomberg, 13 potential medical problems have been studied as negative side effects of vaccines, based on data from 99 million people who received vaccination in 8 countries. It turns out that myocarditis was a common side effect of the first, second and third doses of mRNA vaccines such as Pfizer and Moderna. The first and fourth doses of the Moderna vaccine have also been linked to increased pericarditis, and rare cases of acute disseminated encephalomyelitis have emerged after vaccination with the Pfizer vaccine. An increased risk of cerebral venous sinus thrombosis has been observed after receiving viral vector vaccines such as AstraZeneca and Johnson's, and these vaccines have also been linked to an increased risk of Guillain-Barré syndrome. The study found an increased risk of developing myocarditis after receiving a third dose of the AstraZeneca vaccine in some population groups. Although more than 13.5 billion doses of Corona vaccines have been administered around the world and have saved the lives of millions of people, their side effects and harms are still a subject of debate between scientists and citizens. In addition to the side effects mentioned in the previous text, several other side effects were observed in the study. These effects include:
1. Myositis and skeletal muscles: Cases of myositis and skeletal muscles have been observed after receiving Corona vaccines.
2. Otitis media: Cases of otitis media have been observed after receiving Corona vaccines, especially mRNA vaccines.
3. Digestive system disorders: Cases of diarrhea, nausea, and vomiting have been observed after receiving Corona vaccines.
4. Respiratory system disorders: Cases of shortness of breath, cough, and fever have been observed after receiving Corona vaccines.
5. Headaches and headaches: Cases of headaches and headaches have been observed after receiving Corona vaccines.
6. Muscle and joint pain: Cases of muscle and joint pain have been observed after receiving Corona vaccines.
7. Skin rash: Cases of skin rash have been observed after receiving Corona vaccines.
8. Central nervous system disorders: Cases of vertigo, dizziness, and coma have been observed after receiving Corona vaccines.
However, it should be noted that these side effects were rare and transient in most cases, and that the benefits of vaccination usually outweighed the potential risks.