Viral gastroenteritis (stomach flu)

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  • With Mayo Clinic internist

    James M. Steckelberg, M.D.

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Question

Flu shot: Will it prevent the stomach flu?

I got the flu shot last year, but I still got the stomach flu. Why should I bother getting it again this year if it doesn't work?

Answer

from James M. Steckelberg, M.D.

The flu shot protects against influenza, which isn't the same thing as the stomach flu (gastroenteritis). Gastroenteritis is an infection caused by a variety of viruses, including rotaviruses and noroviruses. Although it is often called the stomach flu, it is not caused by influenza viruses.

Real flu (influenza) attacks your respiratory system — your nose, throat and lungs — causing fever, muscle aches, coughing and congestion. Gastroenteritis, on the other hand, attacks your intestines, causing signs and symptoms such as watery diarrhea, nausea, vomiting and stomach cramps.

No vaccine is available for gastroenteritis with the exception of a newly released rotavirus vaccine called RotaTeq, an oral vaccine for infants. However, you can reduce your risk of gastroenteritis by frequent and thorough hand washing.

The flu vaccine is the most effective way to reduce your risk of getting influenza.

Next question
Stomach flu: How long am I contagious?
References
  1. Viral gastroenteritis. Centers for Disease Control and Prevention. http://www.cdc.gov/ncidod/dvrd/revb/gastro/faq.htm. Accessed Dec. 23, 2009.
  2. Key facts about seasonal flu vaccine. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/protect/keyfacts.htm. Accessed Dec. 23, 2009.
  3. Key facts about 2009 H1N1 flu vaccine. Centers for Disease Control and Prevention. http://www.cdc.gov/h1n1flu/vaccination/vaccine_keyfacts.htm. Accessed Dec. 23, 2009.
  4. Rotavirus vaccine: What you need to know. Centers for Disease Control and Prevention. http://www.cdc.gov/vaccines/pubs/vis/downloads/vis-rotavirus.pdf. Accessed Dec. 23, 2009.
AN01778 Jan. 5, 2010

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