Vaccines are one of the best prevention of a disease by providing active immunity. People with weak immune system should consider taking the flu shot. After the vaccination, one might have a mild case of the flu (better than worse). After the flu shot, a person can get sick before the vaccine provide protection to the body. Also; a person may get a virus whose protection is not included in the seasonal flu shot. The flu shot can cause side effects (flu-like symptoms) that are sometimes mistaken as the flu.
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