What is gastroenteritis?

According to the Centers for Disease Control (CDC), viral gastroenteritis is an infection caused by a variety of viruses that cause vomiting and diarrhea. Though not caused by flu viruses, it is often called the 'stomach flu'.

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1. What is gastroenteritis?
2. What are the risk factors for gastroenteritis?
3. How does the virus spread?
4. What are the symptoms?
5. How can I prevent illness?