Or, if your healthy enough, ride it out and have real immunity that can be passed down the gene line. Flu does not enter the body through a hole in your arm, it starts in the mucosal system.
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Your immune system can create protection regardless of where it encounters the germ. Influenza mutates; immunity after getting the disease is not permanent, just as vaccine immunity is not, and immunity certainly does not "pass down the gene line."
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