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There’s no such thing as “stomach flu.”
Flu, short for influenza, is an illness caused by the influenza virus, and is an upper respiratory tract infection, just like the common cold. The URT consists of the nose (nasal cavity and nostrils), sinuses, mouth, pharynx (upper throat), and larynx (voice box. Pronounced lair-inks, not lair-nicks).

Lower URT infections, like bronchitis and pneumonia, affect everything below the larynx. Main stem bronchus through the lungs.

Norovirus (and other, similar infections), is an upper gastrointestinal (digestive) tract infection. Those diseases affect the stomach and upper portion of the small intestine. Lower GI infections affect the GI tract below that point. Examples would be amoebic dysentery, and C. difficile (aka, C. diff). These cause large bowel inflammation and usually, diarrhea. Bad and I mean awful cases of diarrhea. C. diff has a unique odor (and consistency - looks like it’s full of seeds), and an ICU nurse can tell a C. diff infection just from that odor.

Maybe I’m being particular, or maybe it’s my OCD, but I hate when something is labeled incorrectly.

Thanks for listening to my TED Talk! 😁