The flu is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death.

Symptoms of flu include:

• fever (usually high)

• headache

• extreme tiredness

• dry cough

• sore throat

• runny or stuffy nose

• muscle aches

• Stomach symptoms, such as nausea, vomiting, and diarrhea, also can occur but are more common in children than adults.

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