How to have a fever after getting vaccinated

Because the vaccine is a biological preparation made of a variety of low-activity and low-toxicity viruses, injection into the human body will cause the immune function of the body to operate, promote the production of antibodies, but also cause mild fever, belonging to normal phenomenon, generally do not need excessive treatment, and if the body temperature exceeds 38.5°C, can take ibuprofen and other drugs to control appropriately.