Because when

Because when At the same time observed for the control group, not received the vaccine.

Measuring performance, and frequency and types of adverse reactions; A phase IV postlicensing quality control of vaccines.

Because when the vaccine may experience a rare adverse reactions or delayed adverse reactions, or a specific reaction in people with different pathology, research continues and after certification of the vaccine.

It should be noted that the word vaccine in translation on a professional copper Qing language became the terms vaccination or revaccination.

This vaccination primary means introduction of vaccine into the body.

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