After more than 16 million people were infected, the United States officially approved the new coronavirus vaccine developed by Pfizer, Moderna and other companies last week, which is one of the earliest countries in the world to start vaccinating. Currently, adverse reactions have been reported in many states, and the FDA is closely monitoring them.
FDA is now ready to treat serious adverse reactions and will continue to closely monitor adverse reactions in cooperation with the Centers for Disease Control and prevention.
It is not clear what caused the adverse reactions, but Pfizer, Moderna and other companies used a chemical called polyethylene glycol PEG in their vaccines, which may be the culprit, and some people's adverse reactions will be more common than previously predicted.
Previously, Pfizer announced the final results of phase III clinical trials. A total of 170 people were infected with the new coronavirus in the 44000 person trial, including 162 in the placebo group and 8 in the vaccine group,The effective rate was 95%, and the vaccine efficiency of Moderna was 94.5%.
In terms of safety, the two vaccines did not report any major safety risks, and the vaccines were well tolerated,Most of the adverse events were mild or moderate in duration.
But Pfizer's vaccine caused facial paralysis beforeIt's just that the total proportion is very small.
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