However, the news also mentioned a problem, that is, the vaccine was suspected to have serious side effects in early September. According to media reports, during the clinical trial, participants who were vaccinated showed symptoms of fatigue, headache, chills and muscle pain to varying degrees. Some participants had fever, and some even had high fever. In the second phase of the trial, one participant was accompanied by serious side effects after vaccination. Side effects include high fever and other symptoms. The research team then stopped the trial at this stage urgently, but AstraZeneca later announced that the vaccine had been certified by the British Independent Investigation Committee, and then resumed the trial. So far, no serious side effects have been reported.
COVID-19 vaccine is inactivated. By screening virus strains, culturing and breeding, the virus can stimulate human immune response on the basis of eliminating virus replication ability and infection ability. The research and development of vaccine needs a lot of scientific research and detailed staged experiments. At present, COVID-19 vaccine has some side effects, such as fever, headache, fatigue, muscle soreness and chills, but the overall safety is still very high. The probability of serious side effects is extremely low, and most adults have only minor or no side effects after vaccination. At present, the epidemic situation in COVID-19 shows a strong rebound trend, and the emergence of vaccines will provide the most effective way for human beings to fight the COVID-19 epidemic.