My mom got a flu shot one time, and was sick...really, really sick for 6 weeks...4 of those in bed. Come to find out she was allergic to eggs. She was an egg candler for years when she was younger. She ate eggs, though not alot of them, she just didn't care for them, and never had a reaction. But one time she gets a vaccination and has a terrible terrible outcome! She was told never every do it again. I get them every year!