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Normal lung anatomy

Influenza

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Influenza

Influenza is a viral infection of the respiratory tract that causes coughing, breathing difficulty, fever, headache, muscle aches and weakness. The virus is spread from person to person by inhaling infected droplets from the air.

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Definition Alternative Names Causes, incidence, and risk factors Symptoms Signs and tests Treatment Expectations (prognosis) Complications Calling your health care provider Prevention References

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