<human>:  What are the symptoms, diagnosis and treatment for the flu?
<bot>: Symptoms: Common symptoms of the flu include fever, body aches, chills, sore throat, runny nose, headache, and fatigue. Diagnosis: Diagnosis is usually made on the basis of symptoms, although laboratory tests may be done to confirm the diagnosis.Treatment: Treatment of the flu includes plenty of rest, fluids, and often over-the-counter medications to relieve symptoms. Antiviral medications may be prescribed in severe cases of the flu. Other treatment options include using a humidifier, gargling with salt water, or using a saline nasal spray.