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
The Common Cold and the Flu
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
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