Does the flu shot protect me from the stomach flu (norovirus)?

Answer: No 

Your annual flu shot will not protect you from the stomach flu. The stomach flu is really viral gastroenteritis. The viruses that cause the stomach flu are not related to the influenza virus that causes the real flu. The real flu can sometimes cause a person to vomit, though. My 2 year old vomited a few times when he was sick with influezna A in March 2013. (Yes, he still got influenza A even though he had the flu mist vaccine. Interestingly, I did not catch if from him and I did NOT have a flu shot.)

It is very important to clean with a product that actually kills norovirus when a stomach bug is in your home such as the Clorox® Hydrogen Peroxide Spray and Clorox Hydrogen Peroxide Wipes.
--Annie Pryor, Ph.D.