re: Anyone else feel like crap after their flu shot this year?

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Well, they did inject you with the flu, so you feeling like shite is not outlandish.

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You are given a shot with a very small dose of that years flu. It's pretty much a well educated guess on which flu strain will be prominent that year and give you a shot with it. If your body comes in contact with that particular strain, you already have that strain in your body and you will not catch the flu. Often at times, the "guess" is wrong and that's when you can catch the flu even with taking the shot