According to Pfizer's experimental records, 75% of the subjects will feel tired, 68% will have a headache, 33% will have chills, 25% will have muscle aches, and 17% will have a fever.

The second injection after three weeks should be especially careful. People with special allergies, such as those with severe hay fever allergies, had better inform their family doctors in advance and prepare antipyretics for emergencies. If the allergy is very serious, you can consider not vaccinating.

Precautions for vaccination

You should know your physical condition before you get the COVID-19 vaccine. If you are not sure whether you belong to the forbidden population, you need to provide a health certificate on your own initiative, and the doctor at the inoculation point will judge whether you can vaccinate. At the same time, we should also pay attention to rest well. It is best not to vaccinate on an empty stomach to keep our body in a good physiological state.

In addition, because COVID-19's inoculation site is deltoid muscle of upper arm, it is recommended to wear loose clothes to facilitate putting on and taking off. And carry ID cards, mobile phones and other items and wear masks according to the notice of the vaccinators.

The above contents refer to Baidu Encyclopedia-Pfizer Vaccine.