After receiving a vaccination for the influenza virus, an individual typically develops an immune response that includes the production of antibodies against the virus. This response usually takes about two weeks to develop and helps the body recognize and fight off the actual virus if exposed in the future. Some individuals may experience mild side effects, such as soreness at the injection site, low-grade fever, or fatigue, which are generally short-lived and indicate that the immune system is responding to the vaccine.
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