it's not influenza.
http://en.wikipedia.org/wiki/Gastroenteritissnip:
Gastroenteritis (also known as gastric flu, stomach flu, and stomach virus, although unrelated to influenza) is marked by severe inflammation of the gastrointestinal tract involving both the stomach and small intestine resulting in acute diarrhea and vomiting. It can be transferred by contact with contaminated food and water. The inflammation is caused most often
by an infection from certain viruses or less often by bacteria, their toxins (e.g. SEB), parasites, or an adverse reaction to something in the diet or medication.
At least 50% of cases of gastroenteritis resulting from foodborne illness are caused by norovirus.<1> Another 20% of cases, and the majority of severe cases in children, are due to rotavirus. Other significant viral agents include adenovirus<2> and astrovirus.
Different species of bacteria can cause gastroenteritis, including Salmonella, Shigella, Staphylococcus, Campylobacter jejuni, Clostridium, Escherichia coli, Yersinia, Vibrio cholerae, and others. Some sources of the infection are improperly prepared food, reheated meat dishes, seafood, dairy, and bakery products. Each organism causes slightly different symptoms but all result in diarrhea. Colitis, inflammation of the large intestine, may also be present.
Risk factors include consumption of improperly prepared foods or contaminated water and travel or residence in areas of poor sanitation. It is also common for river swimmers to become infected during times of rain as a result of contaminated runoff water.
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I haven't had it in years, even when people all around me have become sick with it. I think the reason I don't get it is that I wash my hands a lot and use anti-bacterial wipes to wipe off grocery cart handles, and at home I use them on every surface I can think of, including door knobs and light switches.
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