What are colds and the flu? The common cold and the flu (influenza) are infections of the upper respiratory system – the nose, mouth, throat, and lungs. The infections are caused by viruses.

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What are colds and the flu? The common cold and the flu (influenza) are infections of the upper respiratory system – the nose, mouth, throat, and lungs. The infections are caused by viruses.
CC0 Creative Commons Pixabay
Read more…
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