Common Cold Symptoms and Statistics

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The most common viral infection on the planet, the common cold, is anything but simple.

This segment takes a closer look at the common cold, caused by more than 200 viruses with rhinoviruses leading the pack. Although often mild, the cold spreads easily and affects children disproportionately—accounting for a large portion of annual sick days. Knowing the biology behind colds and how they’re tracked helps break down what makes them so persistent.

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