People commonly report systemic side effects, like fever, headaches, muscle aches, joint pain, chills, and fatigue. People who already had COVID-19 and do not get vaccinated after their recovery are more likely to get COVID-19 again than those who get vaccinated after their recovery
Mar 14, 2022 · However, in two recent studies a clear correlation was found between systemic adverse events including fever and antibody titer following COVID-19 vaccination, which is also consistent with our results [7,22]