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According to the article linked in the related links section below:

A cold is contagious for at least a day before you come down with the symptoms. During that time you may be transmitting the cold virus to all of your buddies and co-workers even when you're feeling fine. Once you come down with the symptoms, a cold is contagious until the last of your symptoms go away.

However, the author points out that the virus is most contagious when viral levels in your body are highest, so it is highly contagious before symptoms appear or when they first start appearing, but much less contagious 3-4 days after the first appearance of symptoms, as your immune system will have killed off most of the virus by then. The author recommends,

If you're considering calling in to work, it's a good idea for at least the first three to four days when a cold is most contagious. If you're still sniffling and coughing at the end of that time period, you'll likely still be somewhat contagious, but less so. If you go to work, it's important to use a tissue to cover your mouth when you cough or sneeze and avoid contact with others as much as possible. Your employees will thank you for your kind consideration.

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13y ago

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