The flu vaccine contains inactive (killed) viruses, meaning they cannot cause infection. Side effects common to the vaccine are low-grade fever and aches, which some mistake as symptoms of flu; also, since the flu shot is given during the cold and flu season, there is a good possibility that you are seeing causation where there is only correlation (ie. You may have been infected prior to the vaccine, or you may have contracted a virus such as rhinovirus, which can cause flu-like symptoms). Remember, correlation does not imply causation.
I am not saying that everyone should be getting the vaccine - I personally haven't decided for myself yet - but I AM advocating that you fully research the information provided by professionals, rather than relying on hear-say and myths. My PM box is open if anyone has any questions, but I will preface this offer by stating that I am not a physician, but merely someone in the healthcare field with access to the latest information.
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