A common viral infection that can be deadly, especially in high-risk groups.

The flu attacks the lungs, nose, and throat. Young children, older adults, pregnant women, and people with chronic disease or weak immune systems are at high risk.

Symptoms include fever, chills, muscle aches, cough, congestion, runny nose, headaches, and fatigue.

The flu is treated primarily with rest and fluid to let the body fight the infection on its own. Over-the-counter anti-inflammatory pain relievers may help with symptoms. An annual vaccine can help prevent the flu and limit its complications.

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